Full Site Editing Is No Longer Optional
WordPress Full Site Editing has moved from experimental to essential. What started as an optional feature in WordPress 5.9 is now the foundation of modern WordPress development.
The Shift in the WordPress Ecosystem
The numbers tell the story. Block themes now account for over 40% of new theme submissions to the WordPress directory. Major hosting providers are defaulting new installations to FSE-ready themes. The ecosystem has shifted.
For development teams, this shift brings practical advantages. Template parts eliminate redundant code across page templates. Global styles provide a single source of truth for design tokens. The site editor gives clients direct control over layouts without requiring developer intervention for basic changes.
What Changed in Theme Development
Classic themes continue to function, and WordPress maintains backward compatibility. However, new features and improvements are increasingly FSE-focused. The template editor receives regular enhancements. Block theme APIs expand with each release. Classic theme development, by contrast, sees minimal innovation.
Theme development with FSE differs from traditional approaches. Instead of PHP templates with hooks and filters, developers work with HTML-based template files and theme.json configuration. This requires learning new patterns, but the result is cleaner separation between structure and styling.
Performance and Practical Benefits
The learning curve exists but isn’t insurmountable. WordPress provides comprehensive documentation for FSE development. The block editor handbook covers template creation, theme.json configuration, and custom block development. Community resources continue to grow as adoption increases.
Performance characteristics favor FSE implementations. Block themes typically ship less JavaScript than their Classic counterparts with equivalent functionality. The absence of legacy PHP rendering reduces server load. Sites built on FSE foundations generally score higher in Core Web Vitals assessments.
Client handoff becomes simpler with FSE. Site owners can modify templates through the visual editor without touching code. This reduces ongoing maintenance requests for minor layout adjustments. Support tickets decrease when clients have appropriate editing capabilities.
The Path Forward
For agencies and freelancers, FSE changes project workflows. Initial development may take slightly longer during the learning phase. However, iteration speed improves once base templates are established. Pattern libraries enable rapid deployment of common layouts across multiple client sites.
The WordPress roadmap makes the direction clear. FSE receives the majority of core development attention. Classic theme support remains stable but not actively enhanced. Choosing Classic themes for new projects means working against the platform’s momentum.