I feel like the issue with forced feedback when you downvote is you’ll get a lot of comments where its just 1-2 words, doesn’t say much, just a “No” or “Bad”. And if you require a min characters like the bneg forums you’ll just get “No. 10chars”
Requiring comments will cause people to half ass it at best, I think. Which, sure then people can downvote them, but are people going to write a well thought out comment for every “No”?
Is having 40 “I disagree” comments really better for discussion than just 40 downvotes?