You can def. main both, getting a class to i90+ is pretty easy these days with no lockout. My main is WHM and I love it, now I have almost reached 50 with my SCH, which I enjoy a lot too, and I am already buying gear for the Summoner! After that, I'm gonna level MNK And I definitely plan on using at least those for endgame, because why not? It's one of the best things about this game.