It's a common misconception that Pureblood Garleans cannot use magic.

It's very rare for Pureblood Garleans to be able to manipulate aether, but not impossible. There's a passage in one of the lore books that states as much, plus any player character is generally the exception to most rules in the first place. If a new point of entry were every to be made for the MSQ's, I think they'd make a fine addition as a playable option.