Over the years, I've subjectively found HN to be less optimistic. The tone of the comments here are not significantly different from many other topics.

Note that I am not saying that HN is now less neutral--it may be that the current level of optimism vs. cynicism maps better to reality.

That said, I think more optimism is generally better (for motivating action) if you want to start a new business or build a new technology; more realism is generally better if you want to go down an established path or join a venture purely as an employee; and more cynicism is better if you want to be a rabid online commentator (joke!).