See, that would be cool. Imagine reading a stupid post and clicking the little green frog button to rate it "Get out!" or something like that. And it would get rid of the situation I hated where goons would keep quoting your post 5, even 10 pages later just to chastise you for wrongthink. Just downvote, and move on. But then again the official SA rule is "if you don't like a thread, rate '1' and move on" and we see how well that worked.
I can see it being horribly abused though. Like maybe only troons and POCs being allowed to negrate posts, or bans for rating mod posts dumb. Or the mods and woke crew ganging up on people who rate wrong. Imagine the triggering if you were allowed to vote "disagree" on communist stuff.
You'd probably only be allowed to give positive or neutral ratings. And that still wouldn't work. Remember the guy here who had a massive meltdown over people rating him autistic?
They'd find a way to fuck it up, twist it, and bring it in line with the current forum environment and mindset, not use it to change things and improve the atmosphere.