OP is blatantly lying. It is absolutely possible(and quite easy) to solo FATEs. The only ones you can't solo are the ones with boss mobs(Cactaur Jack for instance).

All the normal ones are easily solable and I've done it myself as Conj, Arcanist, Gladiator, Lancer, Pugilist, and Maurader. If you can't solo them, you are doing something very very wrong.