what do you think of the idea that Witch's and Mage's are related as Witch's have almost complete control of their aspect but little to no understanding while Mage's know a lot about their aspect and use that knowledge coupled with their minor manipulation abilities to sort of "stretch" the limits of their aspect

I don’t quite think much about it, Know and Change are sort of related enough that it’s hard to actually have one without the other, so complete control ‘but no understanding’ doesn’t sound too Witchy to me.