

It’s a different blocking philosophy. Reddit used to work like Lemmy does, for example. The keyword here being “used to”. Here’s their announcement post from when they changed it.
I personally prefer this method of blocking, because you’re not a moderator or administrator and thus should not get to customize the experience of other users than yourself. Yes, there’s the legitimate use case of stopping mass downvoters. But two-way blocking can also be (and has been) used maliciously. You can slander someone and then block them, making them unable to defend themselves or even know what happened, for example.
??? Why should Mastodon become an entirely different kind of site when there’s already Facebook alternatives for the fediverse?