This subject isn't easily settled among folks who have a lesser amount of training, and/or little or no actual experience in dealing with potential deadly force situations.
I've known some folks who continued to carry revolvers or smaller (than duty-size) pistols, including single stacks, even after they'd been involved in shooting incidents.
Some folks seek confidence and comfort in higher capacity handguns, and some seek it in more training and improved abilities with whatever they're already carrying.
Sure, some seek the added "advantage" of greater magazine capacities, or larger models or calibers, and that's fine. Just doesn't mean it's something necessary or desirable by everyone else.
I'm presently carrying a 15+1 M&P40 as an issued weapon, but I'd not mind in the slightest returning to carrying an issued 6-shot revolver again, or my previously issued 4513TSW (7+1), 4566TSW (8+1) or even the 3913TSW (8+1) I carried before the M&P40. FWIW, if S&W had still been making the 3906 (or had ever made a 3906TSW), I'd have carried one of those for both plainclothes and uniform roles.
Capacity and caliber are just ... capacity and caliber. Now, skillset, experience, knowledge of tactics and mindset? Those are really desirable.
Work with what you've got ... and learn to run whatever you've got to optimal effect.