Lesswrong is a strange and fascinating place with some elements that I find disturbing and problematic and others that are quite admirable. It's a place where "semi-crank" people can go and have their ideas taken moderately serious. Like academia, there's a lot of reference to past discussion but if anything they take ideas more seriously than academics - academics will drop ideas that seem like dead-ends or counter-productive but lesswrong won't give up on a thing 'till it's proven wrong. A lot of ideas have been developed, some rigorous and worth knowing, some I find pseudo-intellectual hogwash.
The place indeed has a set of common assumptions that have developed over time and may seem strange to the average person - some of these are quite interesting and others I'd find rather twisted (recently upvoted articles: "AI Girlfriends Won't Matter Much"[1]).
There's too much to summarize but I occurs to me that programmers generally have a certain tendency to instrumentalize human beings and human qualities, treat these as things or as control problems and a lot of lesswrong concerns (rationality, AI and AI-safety, effective altruism, "reproductive strategies", etc) come of this. If anything, Lesswrong is resisted the movement we've seen of libertarians drifting to the "alt-right" and so it's one forums for "this kind of stuff".
Overall: worth looking at and even posting but also it's various ideologies have used by people doing real harm (Sam Bankman-Fried etc). Further, it can produce a situation where it's more reasonable concerns ("AI safety") get distorted by and tarred with it's more ideological concerns.
[1] https://www.lesswrong.com/posts/pGhpav45PY5CGD2Wp/ai-girlfri...