There's also the issue that in the case of White Mage, a lot of the higher level White Magics are probably illegal for even us or the Pajali to use because they are what led to the land being drained of aether. Black Mages doesn't really care all that much about that and so they just go ham with crazy powerful magic use. The Elementals are a natural check on the White Mage job and we know there are certain things White Mages were capable of doing that the Elementals don't want to be discovered.