I’ve been on the receiving end of “underrated comment” and I was surprised to learn it’s not actually just vapor. You don’t usually get comment karma on a post 24+ hours after it’s posted, but on the couple of occasions when someone said this about my comment, it started the ball rolling on people reading and upvoting my comment. In other words, apparently it was underrated, because people weren’t seeing it.
There’s no karma totals on lemmy so who cares, but it was interesting to learn it isn’t entirely fluff, it’s performing a duty in the comment thread ecosystem.