I think kicking with the instep is mostly for snapping kicks since the vector for the force is contained in a smaller area which allows for a better whipping effect. I'm an advocate for using snap kicks because they work great. The only problem with them is that most people can't generate a fast enough snap to cause any damage which is why I think alot of people call them useless. However once you can really snap your leg, the snapping roundhouse is far more devastating then a "push" roundhouse. I know this might be sort of a extreme example but check out Bruce Lee's snap in "Way of the Dragon/ Return of The Dragon" when he fights Bob Wall and the japanese karate fighter.
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It moves all by itself.
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