Reddit as a whole is less useful since comment sections were demoted from first class citizens to something barely usable. I think they saw imgur as a threat and wanted to better replicate that experience.
Reddit comments were doomed in the long run, anyway. The fact that most Reddit commenters are on mobile phones, and not proper keyboards, has led to ultra-short comments light on information or nuance, like Twitter. This is true even on special-interest subreddits for various hobbies, where rich discussion is wilting and image posts and memes have taken over. Sure, you yourself can still write a couple of solid parag…
I can't tell if this is organic or not. If so it might be people leaving Facebook who aren't capable of irony enough to be interesting, but I think it's mobile-optimizing karma farmers.