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Good question Jeff! If I am driving a bus, more than one set of brakes is advisable. But this is not life and death so if it works?????? Why fix it? League catches up? If a smart, good pitcher can master one pitch then in the right time, help him complement it.
If you were Lee Trevino's teacher would you have stressed he "must" learn to draw the ball so he would have a better shot at Augusta? Actually, he could do anything with the ball he wanted to but that is beside the point. Isn't it better to absolutely master that one key shot, his little fade, than to change everything around to "potentially" help with one course?