The comment system on HN discourages discussion of the article, because threads cannot be collapsed and so there is only space for 2 or 3 top-level comments to get much attention.
The top comment is often a poor quality one, expressing some controversial view that gets replies, starving the lower top-level comments of upvotes, and cementing its place at the top.
It would be better to collapse replies to all top-level comments, and allow people to expand the replies to the comments they find interesting.
I'm a fan of experimenting with voting systems, and as this never happens, i'm always disappointed. I think it would be great if the order of comments was always random and scores were never shown (I don't care what people think of other people's comments; how can an opinion have a score? the very idea is preposterous). It would encourage people reading more comments, and not being either fearful of losing points or posting comments just to get a higher score.
Worth noting, the score is intended to be an objective measure of correctness — well sourced, clear, and reasonable comments aught to add to the score, rudeness, questionable sourcing/factualness should not. Ideally.
The problem is, given the current strict comment ordering system & the fact that many (myself included) read comments top to bottom, a 15 in the top position for two hours may in fact be equal to a 3 that's farther below.
I hadn't thought about it when I started writing this, but I'd be curious what comment ordering results a points/time value function would produce. Although a fuzzy random ordering would still be needed to ensure that lower comments got enough viability. So maybe points/time/position-at-vote-time
PS: That said, collapsing comments to promote more equality between highly rated level 1 comments would be an excellent idea.
I am often guilty of this. Why? Maybe it has to do with the assumption that the comments on an article will provide me with more knowledge than reading the article itself.
The discussion here is more dynamic, from multiple parties, providing different views, sometimes correcting errors and filling in any omissions of the article, as opposed to the source piece which is static and written by a single, usually biased, individual.
More simply, most people are lazy and do not have the time to read each article. They also go to aggregation sites like HN or Reddit to get all their news in a single format, and temporarily navigating away from that format can be sort of uncomfortable, especially with the ads and whatnot on most linked articles.
Of course this is not a good habit; the articles should be read, at least before you comment on them. Commenting before reading only increases irrelevant noise and defeats the purpose of the news. Yet, the reasons for why people don't read articles, remain.
Maybe HN and Reddit could balance this by providing a preview of the link in the comments section? Some subreddits already have a bot which provides summary, but it really should be a feature of the aggregation site itself.