This is a special post for quick takes by Sherrinford. Only they can create top-level comments. Comments here also appear on the Quick Takes page and All Posts page.
The idea to have a "agree/disagree" voting button seems better than just vote/downvote. However, it can be just a button for unproductively signaling "this post's overall direction is different from my prior opinions", instead of writing down your reasons for disagreeing, and thus instead of enabling productive discourse and learning. This seems much worse for disagreement than agreement, but unnecessary "ingroup signaling to yourself" may happen in both directions.