I wouldn't say it's entirely hopeless. Just gotta know who's behind the posts. Checking for conflicts of interest is essential. HN is valuable due the fact many notable hackers post here. Makes it easier to know who we are interacting with, what they stand for and who they work for. Invite only communities like lobsters are even better in that regard. Less random accounts adding noise. Some degree of elitism is a good thing.

Yeah I agree. The point I was trying to make is that you can't judge like the share of some actual collective agreeing to something from reading post on forums.