In reply to Daniel.

Experience is important, both in programmers and in long-time users who still might not do any coding, but spend a lot of time on wp-admin. Yes, I love the enthusiasm of young developers, and certainly their ideas should be heard and given thorough evaluation, but a lot of user feedback is needed before any drastic changes, which are hard to work within.
As a long-time classic-theme user, I started using block themes (or block-friendly classic themes) with the classic post plug-in; gradually, blocks felt more comfortable and I switched to a block-based theme when I upgraded to PHP 8 on one site—but am only now thinking about creating a theme part, or a page template.