I was born in the mid 50's, and the way I was raised , meant gun fit to shooter.
So I chose platform that fit me, from what was available then.
Smith K frame, Gov't model of 1911, BHP are three, so that means for centerfire, .38spl, .357, 45ACP and 9mm.
J frame is another.
No .40 cal back then, and none of a lot of what is available now.
Truth is everything one needs in platform and caliber was done by 1935, or 1955 if one includes the .44 magnum.
Even the .38 Super and 9x23 was around .
So for me, the gun fit, which includes reaching and using all controls came first, then the caliber.
K frames also mean .22 lr and 32 in revolvers back then.
Beretta Minx. Bobcat, Jetfire, and others also fit, and this means .22 short, .22lr, 25ACP.
So I do not need or even care about the guns and calibers that have come out since...
Toss me a K frame, and I am partial to 3" ones, and it does not matter if .38spl or .357.
Same with a 1911, it can be 45ACP, .38 Super or 9x23.
Same reason if I were to get interested in ARs again, I'd want a bone stock Colt, like I learned on that sold for $173 brand new, back in the 60's.