Newish player with some endgame questions

[SirNox]

@Enkidoh (had to remove quote cuz too many characters)

Thank you for your detailed response but I think I might have asked the wrong question, my bad! I am aware they are separate roles, but for some dungeons/trials/whatever I may want to be a healer and other a DPS and I don't want to level different classes (already wasted time on ninja, heh...). I was also told that if I put my summoner points in intelligence when I switched to scholar they would still be int, which is why I am assuming I won't be able to just alternate because I will be missing out on mind unless there is some secret I don't know about. I should have phrased things more like that to start but was a bit distracted when making my post, sorry!

Edit: Just saw Ruri's post. That answered one of those questions xD