This is the only purpose I see and with reactions on every post now I don't really see it much anymore. Though, in a similar thought, it would prevent brigades

This is the only purpose I see and with reactions on every post now I don't really see it much anymore. Though, in a similar thought, it would prevent brigades from HN / reddit / etc if it's, say, an unpopular feature or change and it's at the top of their front page for a while. If it's a legit heated discussion and you limit it then you're just to come back in 24 hours to very long, impossible to follow responses. At least this has been my experience when people have left things to cool down them come back and need to respond to everything.