I think this type of two way blocking makes it particularly clear when the person is blocked since it disallows replying and on Lemmy community bans are visible. So editing comments can help with that, as it would be apparent they have blocked you, the UI could be changed to reflect that either by highlighting the user who has blocked you or greying out the reply button. Of course that could be used as an abuse tactic but since it depends on existing replies which are finite it wouldn’t be as bad as them being able to continue making more.

Also since administration on Lemmy is much more in touch with the userbase (at least most of the time) it’s easier to get such abuse dealt with at the community or instance level.