I’m going to start this by making a statement. Most modern and/or non .45ACP 1911’s aren’t technically a 1911. They generally share the overall function and style. Single action trigger, grip angle, etc.
I own probably over 100 various 1911 style firearms. Everything from real original 1911’s, Colt Commander, home built, Gold Cups, double stack Para Ordinance, .22lr conversions, and even a Coonan or three. In probably at least 20 different calibers. Just off the top of my head. .22, 9mm, .380, .45, .451Detonics, 9x23, .38 Super, .50GI, .357mag ...
I don’t know why anyone would have an issue with a 9mm 1911. The important thing to me in a 1911 or 1911 style firearm is the grip angle, single action trigger and single stack magazine. Of course I also own double stack type to, but again not a real 1911 and my hand better fits on single stack. The fit and function is a proven design and if you like it what difference does the caliber really make.
I’ve carried many real and type style 1911’s; my more or less daily carry is currently a SIG P938.