Doing atemi or tasabaki for the sake of just doing it and catching a punch to the face, just doesn't make sense. You perform those moves when it is warranted. If you can't calculate a technique with some accuracy, then why do it in this situation. The videos are not demonstrations. Demonstrations you can plan for atemi or tasabaki, to accomplish those pretty dance flows in Aikido.
I must be confused then and my "calculations" must be off.