Basically, in car engines, the maximum speed should not be dictated by the the horsepower it has. This can become troubling when building tank designs, because tanks need horsepower to overcome the mountains of krakalaboa (I can’t spell that right) and snowstone but if you do the tank can travel at 250 mph which is not realistic AT ALL. So, if jundroo implements being able to adjust the maximum speed then you can set the tank to be able to climb mountains while being able to stay at a realistic speed. Also, it lowers the chance of flipping your tank.