I think tactical/defensive training is so important because it opens you to a whole different world of gun management. I regularly attend a gun fighting course and two things that always impress themselves on me is how people will run a drill “linearly” with no adaptation or improvisation to respond to a given situation. A gunfight is a fluid situation and getting from point A to point B is not necessarily a straight line. The other thing is how when a situation requiring a reload arises people will either stop moving or only move in a straight line. This is why training is so important, in order to allow yourself to learn from your mistakes in a controlled environment rather than under fire.