Before HF21, 2 months ago, there were tons of comments as well on each every post published here. The problem is that, after HF21 code deployment, commenting is not well rewarded due to the new rewarding algorithm and even worst, it could penalize what you can earn as a curator if you try to upvote a comment since it will not reach a value that overpass the profitable mark. That's why commenting has decreased a lot and so it also does engaging.
People upvotes but just a few try to interact with the author since it is not worth the time spent.
I'm still upvoting and commenting everytime I feel so, I don't care about earning right now but it is a pity we fixed some issues and destroy the interaction between us by deploying such an aggressive rewarding algorithm.
Original post btw.