Most of the fates don't encourage you to play your role (and sometimes actively discourage it) and therefore play in detriment to the game because they do not reinforce party mechanics and team work. While a nerf to these things might be necessary, I would MUCH rather see an xp reward increase to Guildhests, Dungeons, and Leves in parity to the current Fate XP ratio before nerfing the only effective avenue of leveling your other jobs.

In my honest humble opinion, the leveling experience in this game isn't very well designed and needs a lot of tweaking in order to make it a fun experience beyond your first class. Fates aren't enough.