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I think it depends on what they would face. Any powerful army wouldn't forgo armored vehicles simply because they can use magic (I'd guess). It provides them with powerful defense and offense. Remember, what we see in the show and in the manga are the elite of the elite. The rest of the TSAB seems to be mere redshirts so they need a little extra something to stand on their own (not that it helped in StrikerS, but maybe it went better than if they hadn't used tanks).
IIRC, there aren't much canon info on it, but this would be my guess.
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