My question would be, regarding changing pistols, is, would it have complications as far as having to switch function/feel in the middle of a gunfight? Meaning, when you change mags, you're still shooting the safe firearms. You (theoretically) only have to become proficient with one. If you carry 4 different weapons, assuming they aren't the same model or of same function, then you'd have to stay proficient with 4 different weapons and be able to think through, in the heat of the moment, which one you are switching to and how it functions differently (safety here instead of there, striker vs. hammer fire, SA/DA vs. DA only, long hard trigger pull vs. softer more smooth trigger pull, 7 round magazine capacity vs. 16 round magazine capacity, etc. etc. etc)
I just wonder if it could be an issue. I guess maybe not if you practised and trained enough.