cohost support

 If the OP blocks a user, currently the blocked user's comments stay up. Even if the OP can not still see them, and they might assume the comments are removed, the comments stay up.
Blocking someone should remove all their comments from your posts, or at least hide them to all other users.

Inversely, you can block someone, but still comment on their posts. This can create a scenario where someone blocks an OP and then targets them in their own comment section, without the OP even noticing.
If you block someone you shouldnt be able to comment on their posts anymore.

I feel both these issues could be a potential angle of attack to be abused by harrassers etc.

Seconding this - far too open to abuse. Blocked users shouldn't be allowed to leave hate comments that are invisible to OP.