I see no reason that magic itself could not be the source of scientific study, should one be so inclined.
However, to answer your question: the most common answer is that magic is, perhaps by its very nature, not something everyone can wield. One may certainly study the theories, but that alone is not truly enough for someone to be able to cast a spell, should they lack the capability to do so.
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However, to answer your question: the most common answer is that magic is, perhaps by its very nature, not something everyone can wield. One may certainly study the theories, but that alone is not truly enough for someone to be able to cast a spell, should they lack the capability to do so.