When I saw my first couple of P365 pistols, the standard manual safety came home with me It was not long until I got a 365 grip module and a few 12 rd mags, with flush baseplate. Being a "civilian" my thinking is that if 12+1 is not enough, then either my target or myself will be in such a world of hurt that I will not need another mag, hence I do not carry a spare. Way back when I was a USAF officer and could possibly be carrying a M92, I checked with the armorer and at the time was told I could have enough pouches and magazines to fill my belt if that was what I wanted, and would have probably done so depending on the location and situation.
Yeah, I only carry xtra mags, because paranoia is a hobby of mine.