This is a great resource that I haven't discovered before - I tend to read mostly from "top lists" when I'm not reading books I've been recommended organically - I appreciate the lifetimes people have already spent separating the wheat from the chaff. Thanks for sharing.
Now, since it's on topic, and not listed in the "list of lists" on the site, I'd like to share my surprising source for book recommendations...
I don't think that the actual discussion forums are worth spending brainpower or attention on, but I've actually gotten a lot of mileage out of the wikis that the 4chan communities of /lit/ and /sci/ curate. The former (/lit/, [1]) does a yearly vote to generate a top 100, but caveat lector: 2020's vote was raided by another board. You can see the past yearly top 100s on one page of the wiki ([2]), and I've not yet had a bad experience picking a book from previous lists (2020's still has worth if you ignore obvious troll entries). Sadly, the lists are usually in the form of an image and not raw text, so it's not very accessibility-friendly. Also to note: if you want to pick a book from a specific region or genre or want to know what order to approach a new author, there are plenty of other pages on the site beyond the top 100, which have also been great resources
Lastly, /sci/'s wiki ([3]) is primarily for reference texts, which is HN's speed. The math books and the Haskell books are a solid list from what I've worked through or skimmed so far (the math suggestions are more numerous than the acclaimed "Chicago undergraduate mathematics bibliography"), but can't vouch for any other subject.
[1] https://4chanlit.fandom.com/wiki//lit/_Wiki [2] https://4chanlit.fandom.com/wiki//lit/_Top_100_Lists [3] https://4chan-science.fandom.com/wiki//sci/_Wiki