I think he means that if you are to shoot three on each target, shooting extra rounds just to go to slide lock (we're assuming you've had good hits on targets) and reload is not what you'd do in a real threat situation. In a real life gunfight, if you had two of four bad guys down, you wouldn't shoot the down guys a couple extra times to go to slide lock, right? You'd be needing those rounds to deal with the next two BGs. That's where it becomes "gaming". Same as people you see not using cover, in a real shoot out you'd be trying to get as covered as you could, but a lot of folks jump out and blaze away, which does make it easier to shoot a stage, but it's not in the spirit of the competition, which is to simulate an armed encounter, as close as possible.
Oh, Happy 4th everyone!