Meh, necromancy was also first studied by mages, and I don't see mages wielding necromantic spells. Once you specialise in such things you are no longer a mage. I think Mages just stick their nose into anything that concerns magic and try to see how it works. It's like it's said in the Harry Potter books: You don't have to USE dark magic to know how it works. Same goes for mages in WoW. They have basic knowledge of all kinds of magic, but once they specialise in something the general Mage population thinks is "wrong" and refuse to stop doing it they become something else and stop being a mage.
I think this is just the Blizzard short hand way of saying: I want my best scientists on this!