I know its common sense, but like my Dad use to say, "Son, common sense ain't common." Something I saw all the time while in law enforcement was guys spending hours on the range drawing and firing their Glock 17 from their Fobus holster. They would get their times down to the best possible score and then go home and put a Smith & Wesson revolver in a pocket holster to go to the store or out on the town.
Doesn't that seem like setting up for failure when it comes time to use your practiced drawing skills? Don't get me wrong, there is nothing wrong with those guns or equipment. I completely support getting your draw times down to nothing. The problem is failing to train your skills in the manner of your life style. Consistency is key. I believe we create a movement memory that will be tapped when we are under extreme stress. If the above mentioned individual has to use his weapon under stress, he is probably going to instinctively go for his Glock 17 in his Fobus holster, only to realize they are at home in his safe and instead he has his revolver in his pocket. So much for reaction time being trained down to nothing. Food for thought.