IMHO, you are creating a possibly deadly training scar with your "Shoot once, holster, mark" routine. Under stress (IE: lethal encounter) you might find yourself doing exactly what you trained yourself to do: fire one chot and then re-holster.
Even if you made a hit there is no guarantee that the BG will cooperate and stop trying to kill you. Handguns are notoriously underpowered which is why the "one-shot-stop" and "stopping power" myths has been very dangerous for amateurs who believe in their existence.
Accuracy is ultimately more important than speed. But multiple hits will be more effective than a single one. As they say, "ammo is cheap..."
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