The person you blocked can still see, and reply to, everything you say. It only denies you the opportunity to respond, allowing them to discredit you and turn others against you without your knowledge. It also doesn’t stop them downvoting you at all, leaving them free to retaliate via vote bombing.
They should be the ones unable to see any comments you make. They should be unable to reply or respond to you. They should be unable to vote on any of your comments or even posts at all.
But it’s the opposite, and therefore completely broken.
I’d take that over the situation now. At least if they had to resort to bannable offenses to retaliate, they’d actually get banned.
All blocking does now is give them free reign to harass you, which completely defeats the point.
Like if we have to be afraid of vengeful users who want to win something, why have blocking at all then? We might as well just bend over and hope they use lube.