I look at aether as I do energy in the real world and I believe it is also explained in a similar way. There's a static amount of aether in the world. It is not added nor taken from the world when spells are cast, it merely takes on a new form which sooner or later is recycled back into the environment which may be reused by our own bodies (at least in regards to Thaumaturgy and Conjury). We should also note that both these schools of magic isn't just a style of channeling aether but each one also has different philosophical views of the world and how aether works. Both come in conflict with each other many times which have caused black mages/thaumaturges and white mages/conjurers to have bias to one school of magic than the other. So if we look at the conjury storyline, and how they said that channeling aether from oneself is destructive, they could also be indirectly bashing Thaumaturgy which we know cast all sorts of destructive magic.
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"As with any good tale, we cannot so easily predict its ending. Never close your book too soon, for there are many chapters in your story that remain unfinished."
"As with any good tale, we cannot so easily predict its ending. Never close your book too soon, for there are many chapters in your story that remain unfinished."