Agree with the J frame filling a specific role as a strong side pocket gun that can be grasped discreetly without alarming the general public.
I carry a beat up 442-2 as a pocket gun off duty sometimes as a backup to a belt carried Glock or K Smith or usually alone when my back cannot tolerate a belt carried anything.
My LEOSA retirement carry guns will most likely be a 3" K Smith on the belt and the 442 in the pocket even though there are numerous bottom feeding handguns in the safe. The smallest semi auto on hand is a Gen 2.5 Glock 27 that works well as a small belt gun but not so well as a pants pocket gun. Too much weight and too blocky for a reliable draw without shielding the back of the slide with the thumb, which breaks the firing grip for me. It is increasingly nasty to practice with as I get older and less tolerant of recoil.