Other people can still see what they write on your posts though, right? What if you muted someone who was harassing you, and they started slandering you in the replies to your own posts without your knowledge? And you start losing friends/followers because of it?

That’s just playing whack-a-mole at that point. They just make new accounts and nothing can stop them

Plus, isn't it kinda a bit of a requirement that social apps have a block feature? Y'know, in order to exist on the app store?