At Blue Kelpie we’ve been working with WordPress since 2011. A lot has changed in the last fifteen years. Full Site Editing (FSE) is hands down the most significant shift in how WordPress. Commonly referred to as Gutenberg (after the inventor of the printing press) the block editor was introduced back in 2018.
To be honest we were not immediate adopters of the new tech. It felt clunky, underdone and just not as easy to use as some of the better page builders. The block editor has evolved a lot since the early days. With query loops and the interactivity API WordPress has become much better suited to developers.
If you’re still new to Full Site Editing here’s a few thoughts on why we made the switch.
01 — Full control over your entire site — from a single screen
In the old WordPress model, editing the site header or footer required changes to the theme’s PHP files. FSE collapses all of that into a single, unified interface: the Site Editor. This is similar to page builder tools like Elementor but using blocks it is more powerful for custom dev, adding navigation drawers etc.
Even for non-developers the Sire Editor is a space where you can modify a page template, change global styles, or rearrange a navigation block. And, you can do it all without opening FTP clients or touching a single line of code. This alone is a fundamental quality-of-life improvement for anyone who has ever maintained a WordPress site.
The shift in practice: Tasks that previously required navigating the Customizer, widget panels, theme options, and a code editor now happen in one place — the WordPress Site Editor.
02 — No-code customisation that actually works
For years, truly customising a WordPress site meant either purchasing a premium page builder, hiring a developer, or accepting a theme’s limitations. FSE changes that equation entirely. Headers, footers, page templates, sidebars, every structural element of a site is now editable through the native block editor, no plugins required.
This isn’t just about removing barriers for beginners. It also means fewer dependencies, fewer plugin conflicts, and a leaner codebase. This reduces the ‘tech debt’ where todays solutions become tomorrows problems. A lot of the design power that once lived inside Elementor or Divi is now built into core WordPress. There are still a few pain points but it’s improving with every release and, using core WordPress functionality future proofs your website.
03 — Global styles for consistent, site-wide branding
One of the most practical features FSE introduces is Global Styles. Define your brand colours, typography, spacing, and button styles once and they are applied everywhere, automatically. Need to update a brand colour? Change it in one place and it cascades across every page, template, and block. This is nothing new to web design principles but WordPress have finally gotten it right!
This is a huge time-saver for agencies managing multiple sites, and an even bigger deal for businesses that rebrand or refresh their visual identity periodically. No more hunting through pages and templates to manually update a hex code or font stack. For the devs amongst us site styling can be quickly configured with the theme.json file.
Under the hood: Global Styles are powered by
theme.json. This single configuration file gives developers precise, code-based control over every design parameter across the entire site.
04 — Real-time visual editing — what you see is what you get
The old workflow for WordPress theming involved a lot of patience. You’d make a change, save, switch to the front end, refresh, evaluate, go back to the editor, adjust, repeat. FSE eliminates that loop entirely. Every change you make in the Site Editor is reflected in real-time, right in front of you.
For developers and designers working with clients, this is transformative. Instead of emailing screenshots or sharing staging links, you can walk a client through changes live, get sign-off immediately, and move on. The feedback loop is tighter, and the process is faster.
Web development tools have evolved a lot in this time as well. With a few simple extensions added to your favourite IDE your build files compile automatically. A little more configuration and your browser refreshes in real time when you save. It’s a great time to be building sites with WordPress!
05 — Block patterns and templates dramatically cut build time
FSE ships with a growing library of predesigned block patterns. These reusable layouts can be inserted into any page with a single click. Think hero sections, pricing tables, testimonial grids, call-to-action blocks, and more. Rather than building from scratch every time, you start with a solid foundation and customise from there.
Beyond patterns, the Template Editor lets you create and reuse full page templates across your site. Launching a new landing page that follows your established structure? Apply a template, drop in content, and you’re done. For agencies running high-volume site builds, this alone can shave hours off every project.
We’ve been creating blocks for a few years and have built our own handy library. These blocks are reusable and highly extensible. We build better websites faster and this allows us to spend more time on the fine details that make high performance websites that are also more engaging.
06 — Cleaner, safer client handoffs
Handing over a WordPress site to a client comes with a certain degree of anxiety. Naturally, clients want to change the content on their website and, as many other agencies will agree, we worry they accidentally break something. FSE solves this problem elegantly. Blocks and templates can be locked, preventing clients from editing structural elements while still giving them freedom over content.
Because everything is managed through the visual editor, clients don’t need to know what a PHP template is or where the Customiser lives. They can update text, swap images, and change colours through a friendly interface — without ever touching anything they shouldn’t. The result is a happier client and fewer support calls.
Using Custom Post Types (CPTs) we are able to further isolate content from design. Developers can create blocks and page templates that pull content and display it cleaning on the front end.
Pro tip: Use block locking and role-based access to define exactly what clients can and can’t modify. Build guardrails in, not documentation they’ll never read.
07 — Better performance than traditional page builders
Third-party page builders like Elementor and Divi are powerful, but they come at a cost: extra scripts, extra stylesheets, and heavier DOM output that can slow your site down measurably. FSE block themes are leaner by design. They generate cleaner markup, load fewer external resources, and are more tightly integrated with WordPress core.
The performance gap matters for real-world outcomes: search rankings, bounce rates, and user experience all correlate with page speed. For sites where performance is a priority (every site should be!), FSE gives you a strong structural advantage before you’ve even begun to optimise.
08 — You’re building on the future of WordPress
The direction of travel for WordPress is unambiguous. FSE is the platform’s primary focus for new development. Legacy tools such as the Customiser, classic widgets and, PHP-based themes are gradually being phased out. The 2025 default theme ships as a fully FSE-native block theme. That’s a signal, not an accident.
Building on FSE today means your site architecture is aligned with where WordPress is heading. You’re not building on a system that will need to be ripped out in two years; you’re building on the foundation that every major new feature will be designed around. That’s a significant long-term advantage for both site owners and the developers who maintain their sites.
09 — Powerful developer control via theme.json
FSE isn’t just for non-developers, it’s equally powerful for those who want to go deep. The theme.json file gives developers a structured, code-based way to define every design token across a site. Default colours and palettes, font families and sizes, spacing scales, border settings, and which customisation options are exposed to end users in the editor are easily configurable.
This creates a clean separation between developer-defined structure and user-editable content. Developers set the boundaries; clients work within them. This creates a far more maintainable architecture than the old approach of scattering settings across PHP files, custom functions, and the Customiser. It also makes themes far more portable and easier to export as starter templates for future projects.
10 — It genuinely works for every skill level
The most underrated thing about FSE is how well it scales across different users. A beginner can build a complete, professional site using patterns, templates, and the visual editor without writing a single line of code. A designer can fine-tune every layout detail visually, in real time. A developer can take full programmatic control through theme.json, block filters, and custom block development.
Most tools pick a lane: either they’re built for technical users and frustrate everyone else, or they’re built for beginners and hit a ceiling when complexity increases. FSE manages to serve both audiences at once. This is a major consideration for us and since adopting FSE we’ve rarely looked back.
The bottom line: Whether you’re handing a site off to a non-technical client or building a complex multi-template theme for an enterprise, FSE gives you the right level of control at every step.
The verdict
WordPress Full Site Editing has matured from an experimental feature into the standard way to build on the platform. It removes the overhead of third-party builders, gives every type of user the right level of control, produces cleaner and faster sites, and positions you firmly on the right side of where WordPress is heading.
If you’re starting a new WordPress project in 2026, there’s no good reason not to build with FSE. And, if you’re maintaining legacy sites built on classic themes, now is a great time to start planning the migration. Get in touch to find out how we can help to bring your website into the world of modern WordPress