I'd say don't block anything at the top and let users filter their own feed as they see fit, except blocking communities is not very effective, in my experience.
More robust filtering and sorting for the user would be welcome. For instance, Reddit Enhancement Suite lets me hover over a name that has an "ignore" button for users, and a "filter" button for subs. That's very user-friendly and effective there. The same here would be a good addition.
I understand that the structure of Fediverse makes this more challenging.