This is a reply to suomynona.
I would have to disagree with your comments. We learn how to walk early in life - yes. But we have to ADAPT our walking actions when we try to dance. Many people walk rather lazily, with feet apart and worse. And most people don't walk about with somebody else immediately in front of them, and we don't rise on our toes, or vary our step cadence in a S-Q-Q (or whatever)fashion.
Perhaps you should ask some judges why they're so fussy about beginners closing their feet correctly (in slow waltz, for example) and using toes and heels correctly? and why they're not just looking at the sway? The judges' answers might be interesting.