It's not exceptionalism to lament the downfall of the tradition of carefully cultivated discourse. I still remember when this community used to be different, and this site was the one I went to first.
> There's no reason why HN should have a higher quality discussion than some generic subreddit or FB comment sections.
Yes, there is. HN uses to have a higher quality discussion because it was carefully moderated both by the community itself and the moderators. Sadly, it seems that all communities deteriorate eventually.