With that ability, though, concepts such as pressure are irrelevant. Therefore, something affecting a wider area, such as a slap, or better still, a body slam, would be more effective. Additionally, the fighter would want to avoid the other problem, of his fist shattering. Therefore, they would want to actually attack more slowly.

In short, you've created someone who fights most effectively by doing the exact opposite of what most people do to achieve te same thing.