> can be done by making an account private, or not posting the posts publicly

but not the criteria where you _want_ other people to see your posts publicly.

aka, the ask is to allow individuals to "excommunicate" a particular user, not just blocking.

I'm glad, tho, that twitter does not allow this. I think having this feature allows for echo chambers...(tho, this is currently already true so may be it's moot...?)