I wish there was some kind of guarantee. Like, maybe FATEs drop Atma tokens and after so many, you can go buy an Atma. Maybe make it cost 40-50 tokens per Atma. You still have a chance for RNG to be kind and give you an Atma, but if not, you at least know you're not going to be farming the same area for 35 hours.

Overall, I don't think it was a bad idea, but not implemented as well as it should have been. Some people have gotten lucky, others haven't. I've spent maybe 25-30 hours (maybe more) so far, and I have 7/12, but a good 8-9 of those hours has been in Upper La Noscea, and that one still hasn't dropped.