Actually I strongly disagree with that view - the fact that it has no real world basis makes it very easy to include, because you don't have to worry about balancing it against things like "realism" and historical data.
Take a look at some of his other views - it seems apparent that he's having problems balancing weapons* and armour*, for example, because of the historical "arms race" ways in which they were developed.
But magic is fictional, and thus doesn't have those problems. You could create a magic system designed from the ground up to be well-balanced - not just between different schools of magic, but also between mages and warriors - without having to worry about historical precedent.
* Of course it's a bit strange to insist that weapons and armour within a fantasy world should be exactly the same as those in the real world. If magic exists, and is a potent tool in battle, then the chances are it will have had a profound effect on the development of more mundane weapons and armour.
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