[danielbarla]

Removal of downvote is not necessarily enough, it doesn't stop differing comments from being drowned out in an echo chamber.

I really think that the problem is somewhat embedded in two things: human nature, and practical limits of our attention. For the former, what I mean is that essentially discussions tend to get driven towards extreme or biased views, because people with moderated, centrist, or less extreme views are less likely to say anything. As the community grows, eventually there are enough people with extreme views that the limit of how many comments you are willing to read through is saturated with them. Eventually one view becomes predominant. And I guess, the last factor would be that people enjoy seeing their beliefs echoed back to them, as a form of validation - aannd we've hit peak echo chamber.

I honestly have no real solution to this, other than trying to stay within smaller subreddits, where the middling opinions are not yet drowned out. And preferably ones that are well moderated, and have expectations of quality posts (you mention HN, and the self-moderation of the community here is a good example, jokes and other shitposts are regularly voted into oblivion, although this trend has been slowly diminishing over the years). As for specific subreddits that are great examples, it is hard to point out, because they are so specific.