I am an indoor range pistol shooter. I shoot .22LR for grins and 9mm for doing serious damage. I see all the rest, the .380, 357 magnum, .40 caliber, 10 mm, .45 ACP, etc., etc. but for what. I never carry. What difference does stopping power make. Besides I hit what I aim at. If I did carry, 9mm would serve me fine. We aren’t talking Cape buffalo here. Extra money in my pocket.
So now the important question: what’s wrong with me?
I see your line of thinking. All my semi-auto pistols are 9mm. Part of my decision making process was that it be 9mm. I reload 9mm so it makes things easy for me. When I bought a single action revolver I chose 45 Colt. Again because I reload 45 Colt my next single action I'll likely prefer 45 Colt. Does not mean I won't change my mind on something but I follow your logic. The fun part is we have so many choices and none are wrong, or right for that matter they are what we want them to be.
-jeff