Filtering for blocked people as well.
To me, it seems like this is more of a UI tweak. Especially since filtering already happens some locally. An option that a user could turn on or off depending in their individual usage.
I think I'm carrying some baggage from my years as a more traditional web developer, this protocol flips a lot of those ideas on their head and maybe this is the wrong way to think about these new problems in this new paradigm.