I, for one, welcome our new block-based overlords...

But seriously, my experience helping clients with WordPress has been that, for those with no experience, learning to work with blocks is much easier than learning to work with the 'classic' editor. I didn't expect this, but people just 'get' blocks when they bring no baggage. Basic layout tasks, such as how to reliably flow text around an image, which I had to explain with hand-wavy 'just trust me' instruction, are now much more intuitive for newcomers. I typically spend about half as much time showing people how to edit their content with blocks vs what I used to spent with the 'classic' editor. And our designer dreads going back to sites that still use the classic editor.

At the same time, we're always careful to restrict clients to content-only editing unless they insist on admin access. I look forward to seeing how this will be managed in the brave new world of block-based themes. Existing solutions use role-based restrictions to maintain the separation, which seems like a reasonable approach.