I already told you. If I am at a range shooting for a score, I'm going to use the best 2 handed grip I can. If I am kneeling with a radio in my support hand, I am not. If I am at the range shooting for a score, I am going to take my time to get the best sight picture I can. If I am moving through a door overseas, I may not have time to use my sights at all. And if I'm at the range shooting for a score, I am going to take my time and time my breathing with my shots to minimize the impact the motion of my body has on each shot. If I am drawing and firing on a gunman during a traffic stop or returning fire after an ambush Afghanistan, I am NOT going to be controlling my breathing the same way. The application of fundamental once uses while taking precise shots on a safe range is just not always possible when you're being shot at, or when you have to do other things, like shooting laying down shoot with a radio or light in your hand, shoot while dragging another person backwards out of a kill zone. You simply can not place the same emphasis on those fundamentals in every situation.