FATES already award Gold, Experience, GC Seals, and ATMA/Alexandrite.

Allied Seals would be too much.

All they need to do is remove the Myth/Soldiery from the hunts. Why should people be able to cap their Myth/Soldiery while earning Allied Seals at the same time? Shouldn't there be an opportunity cost? What's the point of running a dungeon now? If I had a fresh 50, I'd just do hunts to get all my gear with the current system.