[tpeo]

I disagree that a comment has to be sourced to be a contribution to the discussion. Whether or not something can be a contribution depends entirely on what people expect from comments. If all I expect is to have a little bit of thought, it doesn't really need to pack on citations, and even a question might suffice.

Which might sound dilletante-ish, but isn't really out of place for anyone reading a pop-sci article on animal cognition during a Saturday evening, on their spare time.

As for downvoting or upvoting, I've never seen any actual evidence that either does anything useful.

[AsyncAwait]

There's a difference between a comment stating an opinion having no citations, (I think that...) and one supposedly stating facts, (You cannot have...). At least if we want HN to maintain a higher quality of discussion than 4chan.