I find myself clicking insightful for things that are well-written, but that I don't agree with. Whenever I do, I find myself feeling quite uncomfortable.
People use upvotes and downvotes to mean "agree" and "disagree" on Reddit. They shouldn't, but they do. Some people are using "insightful" and "funny" in the same way over here, even though "funny" is functionally an upvote and insightful is two.
If we had agree / disagree buttons in addition to insightful and funny, we would be able to more clearly see the general consensus.
This'll bring the total number of wanted buttons up to 5:
This way, "controversial" will become a useful sorting method! (But think carefully before providing a way of sorting by agreement, either net or gross.)