If I understand correctly, the real complaint here is that FATEs have been tied to Atmas. If you're just playing normally on a pre-50 character, I don't think there's anything wrong with them. They can be a fun way to gain extra exp, there are varied goals to suit different people, and there's a nice sense of community sometimes, when a bunch of random players arrive and all start working together. I'd be sad to see them go.