> which I agree would be good for all humankind.

I disagree with that statement. I know it's fashionable on HN to spit on Reddit, but for all its flaws, Reddit also birthed fantastic communities that are hard to replicate somewhere else due to the network effect, e.g. /r/WarCollege, /r/hoggit, /r/AskHistorians, /r/Rust, /r/LinguisticsHumor, etc. – come for the dumb memes, stay for the niche communities.

If you are talking about default subreddits then sure but there are some great communities on reddit that I think are great pieces of the internet. A lot of which I'm sure exist because people don't need 100 different forum accounts to access them. Also generally, I see no difference between reddit and Hacker News except Hacker News drips with a unique brand of elitist smarm you can't get elsewhere.