Before participating in IDPA, I carried a Charter Bulldog. It was only after a couple of years of IDPA matches that I felt competent enough with a 1911 to carry one every day.
The first year of IDPA was quite a revelation! After decades of target shooting from a stance, I never dreamed how FAST I could miss a man sized target 7 yards away LOL!
Or how easy it is to not seat the mag completely when under pressure and have it drop out of the bottom of the gun on the first shot.
Or how easy it is to not watch where my muzzle is pointing.
Or how easy it is to forget to take off the safety.
Or how easy it is to jam a gun that never jams at the range.
Or how slow a slide moves in cold weather when you have too much grease on it.