Nonsense, I have all classes at 60 all of them were leveled via fates except Monk/Tanks/Healers. I can play them all just fine in a party except Black Mage and Ninja and that's only because I hate them both and only leveled them to have them leveled.

and yes I was more pointing to the fact that Wait times are horrendous as DPS so you'll level much faster with those classes in fates.