Given enough eyeballs, all content is shallow.
For most of the past decade, Reddit have pursued a growth path, with features and changes designed to hook and keep on-site an ever-growing number of eyeballs. Put the blame for that squarely on Conde Nast / Advance Publications / Steven Newhouse (CEO).
This has had corresponding impacts on the quality of discourse. My own response, as noted at my personal subreddit, is to take my time and attention elsewhere, which seems to be widely reflected across other subreddits I've followed. (See: https://teddit.net/r/dredmorbius, particularly pinned posts.)
HN has remained one of those places --- moderation, search, and a reasonably-well curated membership seem to help. It's not ideal, but it's dramatically better than typical online forums, and has maintained a remarkably even keel for going on two decades, all but unheard of.
For various reasons, progress to implementing an independent blog have lagged.
As a lark I created a new account that blocks idiots, though I've not used that sufficiently to determine if it has a positive impact on S:N ratios, though I suspect it might. The idiots are, however, legion.
If anyone else wants to try that practice and report on results, I'd be interested in how well it does or does not work.