Why do we need to signal agree disagree? If you disagree, reply. The reader doesnt need comments sorted by most popular sentiment, that just reinforces bubble

Why do we need to signal agree disagree? If you disagree, reply. The reader doesnt need comments sorted by most popular sentiment, that just reinforces bubbles. I don't upvote things I agree with, I upvote unique contributions to discussion that arent the platitudes spread everywhere else, even ones I disagree with.