A personal point of reference, regarding accuracy with snub-guns:
In 2002, I transitioned to G22 duty pistols, when I realized my then-mandated Safariland 070 police duty holster was an unacceptable hindrance to attaining a proper initial firing grip on my 1911 duty pistols, at the outset of the draw. A Glock being more forgiving of this imperfect grip, and with a trigger that my medium-length index finger could effectively reach, made it the seemingly best candidate, among the four authorized duty pistol choices. (My 1911 pistols were "grandfathered" as duty pistols, as transitioning was not mandatory when duty pistol policy changed.) I added a G27, too. Well, the Glocks served well enough, but I could not shoot them better than my spur-less-hammer SP101 "back-up" snub revolver, and not much better than my J-Snub. (Actually, on a "bad" day, I might shoot the Glocks worse, while long-stroke DA would be more stress-proof.)
I soon sold the G27 to a colleague, and bought another spur-less-hammer SP101 snub , and then a snub SP101 with a hammer spur. Later, I added a 3.1" SP101. I carried two or three SP101 revolvers, or, sometimes, a medium-sized 4" revolver plus a snub-gun, during personal time, until well into the 2006-2008 time frame, when I worked P229 pistols into my personal-time carry equation, resuming my earlier habit of carrying my duty handgun during personal time. (I had switched to SIG DAK pistols, with optional slimmer triggers, as duty pistols, replacing the Glocks*, when it became OK with PD policy.)
Why multiple snub-guns? Well, first, ambidextrous access, because I am effectively ambidextrous with these weapons, and in the real world, something might hinder the availability/capability of either one of my hands. Secondly, speed of the "reload," and, and third, a speed loader pouch is about as bulky to conceal as a holstered snub-gun, anyway, so why not carry the whole weapon? (Nice, flat Speed Strips can supplement, of course.) A wild-card reason is that I can carry more places, as a Texas peace officer, than my wife can carry, as a handgun licensee. She could arm herself in an exigent circumstance.
*I am back with Glock duty pistols today, because Gen4 fits me much better than the Gen3 I used earlier, so I shoot them better, and because my chief OK'ed 9mm duty pistols about the same time .40 Snap & Whip became a bit too much for my aging hands/wrists. Concealing blocky Glocks on my skinny frame, however, is complicated by the wide, blocky Glock-y slide that protrudes so far to the rear, so I may well return to multiple-revolver carry after retirement.