Well I'd rather have 15 and need 6, than have 6 and need 15. Today's average engagement tends to have more shots fired. While a lot of that has to do with poor marksmanship, I've always belived that accurate fire directed at your adversary's position is excellent cover. If he has enough ammo to do that and you don't, you might get caught short.
While not every gunfight is going to offer you a free fire zone, neither is every gunfight going to take place in a sea of non-threats. Crimes of opportunity usually occur when predators select a victim and attack in low light, in a secluded area, and/or where witnesses aren't present.
I can do a 7 yard, six shot engagement (Bill Drill) in about 2.2 seconds, including the draw. It might take that many rounds to stop a single adversary, perhaps even more. Now that that's done, would I prefer to do a threat scan with a gun containing additional rounds, or do an empty gun reload with a speedloader or speed strip?
I love revolvers and have quite a few. I carry semi-autos for several reasons.
Yeah, I'm just gonna say that I've seen this guy shoot with a revolver and he was the quickest I've seen by far. If he says he carries a Semi-auto then it says something to me....