Grow out of what? I've shot 40k pistol rounds down range in practice and competition. When I practice fast shooting with my carry weapons, it isn't playing. When I keep all rounds on target, I'm not playing. I don't mag dump. That is a waste of ammo.
I'm trying to see how to not take this as a personal attack, being basically called immature. Anyone suggesting slow firing when being taught how to fight with a pistol would be laughed out of the class.
I will not respond with any personal attacks back at you. I practice at full speed, because things happen fast. I have a family to protect if thing go sour.
When I'm told that I am firing my rifle too fast, because I am shooting at a Rifleman's cadence of one round every breath, I'm also going to be annoyed. It doesn't seem to matter that all my shots are in a 6" group at 100 yards with iron sights.
Shooting competently and rapidly is not the same as immaturity.
You are correct, sir.