@Graham: Answering out of turn, I can make a diagonal sword cut, with a heavy bokken, full speed, bringing it to a natural full stop, while standing on one foot. Not bragging, it's a basic skill and anybody out there who can't do it already can learn it fairly quickly.
But if you get in the way of that bokken, you're going to be sorry. In what way is this attack unbalanced?
I could say a madman who can do the same thing. He's unbalanced.
The theory works if you only consider physical.