Hiding is a bit of a carry-over habit from Reddit. Basically if I've seen a post, I typically hide it to clear away the feed so I don't get stuck looking at the same thing for a long time until more content rises. That way I can see older stuff, which, on Hubski much more than Reddit, is particularly useful, since we're encouraged to continue older discussions.
But in any case, I've just decided that I've subscribed to a few music-related tags ( #metal, #punk, #musicforpabs, #hubskioriginalmusicclub), and I'll just occasionally check the #music tag separately and see what's new (and especially to see if there's any secondary I might be interested in following). I think that's work well enough for now.