It's the gearposting, the youtuber posting, the people mentioning isi in threads that aren't hers (I don't care whether it's her trying to troll or whether there are actually people who mention her), the loss of the few good trips, the new slew of garbage trips and terrible, frequent non-trip posters, etc. Also, in my opinion, the zoomers coming in have almost zero knowledge of photography and a lot of them are film memesters that are snapshitting without thinking. I see a lot of naive zoomers posting retarded opinions, or absolute bottom-of-the-barrel snapshits. It's a change in demographics, I think, with more zoomers, less non-gearfag millennials, which results in too much gearposting/fanboyism/media-fagging and low quality trash.
