Are you sure it's not because you're better educated and harder to impress? I thought the same thing until I did a deep dive on some old articles and the comments weren't noticably different.
Probably a factor, I also think it's partly because the forums I use at the moment used to be programming centric, but have since broadened their appeal. Hn to Tech business, reddit to literally everything. Lobste.rs has been a fantastic alternative for decent discussion