One thing instructing and competition taught me was carrying in the same place with the same type handgun, is that the grip and all of the controls are identical between my comp gun and carry gun, and it’s in the same place on my body for both. In my case 3 o’clock.
In a violent encounter, that 1/2 second difference of getting the gun out and on target can make a difference. Your subconscious takes over and there’s no time to be fiddling with a different grip, presentation, or God forbid, manual safety’s
We taught the 3-3-3 theory generally. That if there is such a thing as an “average” encounter, it will take place within about 3 yards, last 3 seconds, and with 3 rounds fired. Our qual for newbies in our basic CW class was just that, from a concealed holster.