> HN posters tend to be overly critical, often tripping over themselves to demonstrate

That's the helpful part though, as one of the only communities that is overly critical instead of too much on the other end of the spectrum like every other community. Criticism helps you refine and sometimes even see new perspectives, and the other chaff and useless comments you can just ignore, doesn't really matter, as your experience shows as well. Ultimately I think you get back what you put into the HN-machine.

I do agree LLMs water down human writings to a extreme degree and people should just wholesale avoid them except for very surface-level copy-editing fixes, like spelling mistakes. Don't ask for their feedback how something feels or if it's "dumb" or whatever, use your own intuition.

I get where you're coming from, and I agree to some extent, but I do think our tendency to weight criticism more favorably than praise (as if praise is "chaff" and criticism is automatically valuable) can be dangerous. This negativity bias unfortunately led me to adopt less-than-optimal ways of working in my younger years, because I assumed the people offering me criticism knew what they were talking about, when this wasn't always the case.

So while criticism can be valuable, I think it's worth reflecting an equally critical eye back at the person who is offering it, as upon closer inspection they may not be worth listening to at all.