Combat or being a Law Enforcement officer ....(and probably needing high capacity is one thing ) ...but civilian defense is an entirely different thing...
I have a relatively large collection of S&W revolvers - especially in .357 mag...and carrying a K frame S&W ( model 19 or 66 - especially in a 4" ) with 6 shots is plenty of defensively capability....
...same thing on a 1911 ...whether its in a 9mm ( with 10 + 1 ) or .45 acp with 8+ 1 rounds...its plenty of firepower.
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I train every week with some of my handguns ( 6 - 10 boxes a week or so ) primarily as a hobby ...because I like to shoot ( draw from a holster, double tap a target, reloads, etc...) ...some weeks I'll just shoot one of my 1911's - because that is what I carry ....or some weeks "its a revolver week" ... / my training standard is to draw from holster and double tap a target in under 3 sec...and it makes no difference if its a 1911, a S&W K or N frame in .357 mag...or a double stack Sig 226 ....( now 3 sec isn't lightning quick - by competition standards...it should be closer to 1.25 sec / but its my standard - and at 62 yrs old ...its good enough / if I'm 90+% on target out to 30 Feet/ some days I'm 100% , some days, not so much....) - but in my opinion, its a competent standard.
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In general, I think everyone should carry the gun they shoot the best...and while budgets certainly enter into selecting a gun ...for those of us, older guys, that can basically afford to buy and shoot whatever we want...there are a number of us that turn to 1911's...despite their low round capacity. Its about the Fit, the excellent triggers(how they break and reset), slim profile, etc...
my primary carry gun, is and will continue to be a Wilson CQB model, 1911 obviously - 5", in .45 acp....but yesterday, out shopping... I dropped a S&W model 19 4" Nickel . 357 mag into an IWB holster.....and it was just fine as well..
There is no right or wrong answer to this ....but I'll never carry a poly frame gun of any kind...(not even a Wilson Spec ops - poly frame )...but I'm old school.../ and the thickness of a big double stack gun is not very appealing to me either...while I have big all stainless models of Sig 226's in 9mm and .40 S&W, I never carry them ..even though I have good horsehide holsters for them...I do train with them some weeks...but I just don't like to carry them....
For me, I have nothing against a 9mm....I'll carry a 1911 in 9mm once in a while....but a 1911 in .45 acp or a S&W K frame in .357 mag ...just make me feel warm and fuzzy....