As an old-timer who used to be very active but isn't anymore I agree with you. When I first created an account 1883 days ago I thought this place was amazing, and that I'd never seen such high quality discussion on the Internet before. Now I don't find the quality to be quite as high, but after thinking about it I've realised what has changed: Me.
It's been 5 years, and I've changed. I've become much more knowledgeable than I was five years ago (partly because of HN) and obviously the barrier for what I find insightful has been raised. This is a natural progression in life, and it happens to everyone. Chances are that if you look at what you did 5 or 10 years ago you'll find it to be naive, shallow or obvious.
It's been 5 years, and I've changed. I've become much more knowledgeable than I was five years ago (partly because of HN) and obviously the barrier for what I find insightful has been raised. This is a natural progression in life, and it happens to everyone. Chances are that if you look at what you did 5 or 10 years ago you'll find it to be naive, shallow or obvious.
Maybe it's simply time to move on.