A bit surprised that blockers appear to be all technical issues.

I really like FSE and block themes, but parts of the UI are imho not ready for main stream.

The “browse mode” is a step in the right direction, but why do I have to edit a template (any template) to access Global Styles. That doesn’t make sense to me.

If you remove the Beta label the suggestion is that it’s ready for prime time, ready for WordPress beginners to customize their sites. And it isn’t yet.