The GM gets the final say on whether any maneuver or martial arts style is appropriate for his campaign. Once a martial arts style is approved for his campaign, he may later, after sufficient playtesting, decide that the style must be revised or dropped entirely, and should do so if it is too efficient or abusive.
How can you tell if a style is too efficient or abusive? One good sign is if everybody in the campaign wants to buy it all of a sudden. This means that it is so combat-efficient that players are more than happy to trade in their characters' individuality for something that is especially point-efficient. When this happens, reevaluate the martial art, see which maneuvers are "too good" and modify things so that the style's efficiency is slightly reduced—but only slightly. Then, begin evaluating it again.
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