Quote Originally Posted by FJerome View Post
... the actual art is available to be discovered in other ways, the new Black Mage quest-line is even built on that premise.
I haven't gotten all the way through the Black Mage questline, but from the beginning of it which I've seen, it seems to be lore appropriate to be a black mage, but not very lore appropriate to openly admit to being a black mage. So when in-character, black mages should probably still call themselves thaumaturges, to hide the fact that they're actually something more than that. It comes out sounding to others the same as if you were roleplaying as a THM, but isn't exactly the same thing.