From Schlock Mercenary: "Oh, I love aiming. It's my very favorite thing to do before firing."

AI use without checking its output (at least at the moment) is firing without aiming. Sure, you can fire really fast. But who cares if you don't hit what you need to? The point wasn't to just shoot bullets, the point was to hit your target!

I mean, you might make a case that enough of them hit the target that shooting fast is a net win, and accept the occasional friendly fire incident. That might possibly be true. Or it might not. I'm not sure that everyone trying to run fast has really done the calculation, though.