I don't have experience with Black Mages, but the Warrior questline seemed to be all about the problems they face in controlling their rage. I don't want to spoil anything, but supposedly, losing your mind by using Warriors' techniques is a very real threat. The common people seemed to fear Warriors, although they were appreciative of the help. It was almost like having a leashed monster to defend against other monsters; there's some risk involved that you'll see when or if you chose to do that questline. I thought it was an interesting dynamic. The Warrior has this internal struggle that he willingly subjects himself to, only to be seen as a monster to the very people he sets out to protect.
