I like my published stuff / comments etc getting attention. But only as a sign of people internalizing it, learning, enjoying, reflecting on their views & so on. Transferring knowledge, exchanging ideas, sharing projects, help fix problems others are having, that kind of thing.
Like on HN: if there's a story with maaany comments, I don't usually bother aside from reading. For a story no-one cares about, same thing. In between, if what I'd like to add is already mentioned, not much point in elaborating. But if not: sure, add your opinion or datapoints.
Same with science papers (I don't write those): if your paper advances the state of the art, then publish! If it might, or adds datapoints to hotly debated subject, yes plz. But if it's just 101st attempt that's been chewed on by everyone and their dog & few if any peers will ever read your paper, why bother? (and why bother with such research - find more interesting subject). More crap out there just makes the interesting stuff harder to find.
Btw: doesn't mean you can't re-visit a subject that's last been done long ago, or by few others, and where tools / environment / knowledge has changed since then.
Or if you publish some project which has been done by many, but yours is more up-to-date or better documented than existing ones, sure add value to what's out there.