It's really a terrible idea to tie Atma up in FATEs. Not only does a swarm of lvl 50 people largely naked except for their relic and chocobos come and clear the FATE before you can even hit anything, the new FATE scaling means that some fate mobs are quite hard to kill even for that swarm. I can't imagine what it'd be like for a small group of new players trying to clear one of these fates by themselves.

Honestly, FATEs were one of my favorite features in level 1-30. I would be wandering around questing or doing my hunting log and a FATE would pop and a small group of low level folks would kill rats or something together. Making FATE grinding a thing makes them really horrible and unpleasant for everybody involved. I hated it before 2.0 and I hate it now.