Excellent question for general conversation & kicking around ...
Like the rest of us, I've asked myself that from time to time ...
I've taken to carrying a 642-1 off duty quite a bit, mostly since it's summer and I'm more comfortable wearing lighter & cooler clothing while riding my motorcycle. The 642-1 fits very easily into a mini camera case that nobody looks twice at ...
Back to the subject, though ...
While I usually carry anywhere from 2 Speed Strips to several speed loaders, I still only have 5 rounds in the weapon, and this factors into my practice and training. The proper use of the first 5, and whether or not they're sufficient for the situation, will determine whether thinking about the speed loaders is a moot point.
When I reached the point where I could make rapid head shots on a target set out between 5-7 yards, while moving laterally, I decided it was a reasonable risk to carry it as my only weapon at times. To test this ability I used a qualification scenario we had a while ago, where the shooters had to make COM hits with their pistols while moving. Instead of COM hits though, I trained until I could restrict myself to head shots, and do it faster than almost all of our folks could do COM hits with their pistols. As long as I take the time necessary to maintain this level of proficiency I'm comfortable carrying a 5-shot snubnose.
Hey, for the first 6 years of my job I carried a 6-shot revolver with only 12, and later 18, extra rounds of ammunition ... but I only had the initial 6 rounds available before reloading. I guess I just didn't know any better back then ..