I developed a plugin for it. None of the external plugins worked properly.
Creating a block plugin is super complicated, before you just added a php file, even one line in functions.php was enought for a shortcode, now I have to create a different npm project for every block.
I happen to know how to do it, but it's not easy anymore.
That's just dev side of it.
UX is a disaster, structure and content are mixed. So for users its hard to understand what's content and what's structure.
The design in edit mode and real is very different often.
>I happen to know how to do it, but it's not easy anymore.
Yes, but it's also more robust and modular than the easy "mixed mess with direct access to everything" that was the way you added such stuff before.
>UX is a disaster, structure and content are mixed. So for users its hard to understand what's content and what's structure.
Not sure what you mean with this. How is structure and content mixed UX wise? If anything I found it more separated than before: a title for example is it's own block, not just an element in a mess of HTML inside a textarea that has the whole post.
I've had given the block editor to users with experience from old WP and new WP and they didn't have any problems (or at least not any more than they'd have with the old editor).
10% fees for the free plan is not to bad