It basically takes all the luck out of it. If you pick a corner keeper has 50/50 chance of diving the right way and a decent chance to save it if he does. The margin for error on top bins and right on the corner is pretty low even if the keeper can't ever save it. With the stop start/jump pen keeper basically has no chance if it's done perfectly. Either the keeper doesn't move and is too late to react when the taker passes it in or the keeper crumbles under the pressure and makes the first move and the taker can just pass it in to the other corner.