"Beware of the old guy who only carries 6 rounds in a revolver. Chances are he knows how to use it well!"
I read people writing that thought but it doesn't square with my experience.
I was hired by my sheriffs office in 1981. Our department of about 350-450 armed issued the Combat Masterpiece/Model 15, mostly, but allowed personally purchased S&W, Colt and Ruger .38 and .357 revolvers that met department specs. About 1/3 to 1/2 of the deputies carried the issue revolver.
A new sheriff began our transition to semiautomatics in 1991. There was no money for new department guns at the time so he allowed a pretty wide range of personally owned semiautomatics in 9mm, 10mm, .40 and .45 ACP. You had to also buy your leather and spare magazines if you wanted to carry a semiautomatic. The department provided training and ammunition.
Eventually the department began buying and issuing semiautos, beginning with Model 4006's. They were initially offered on the basis of seniority. You still had to buy your own leather
After 2 or 3 years of this, we still had a batch of deputies carrying the office revolvers, and they were pretty well all older, long-time deputies who were not among the better shooters in the department; most didn't qualify by much on our easy courses, and some often needed to shoot it 2 or 3 or more times to pass. I talked to quite a few of them about it. To a man, they all eventually told me that the reason they hadn't swapped out for a semiautomatic was THE EXPENSE OF BUYING THE HOLSTER AND MAG CARRIER and the trouble of learning a new gun!!! They hadn't ever been involved in a shooting and didn't expect that they would be in the few years left they planned to work, and they weren't going to spend $100 or more just to carry a more complex gun for 2, 3, 4 or 5 more years!
I did not know of any deputy in my department or officer in any other local agency that were much above average shooters that kept carrying a revolver by choice and were really good with it.
I think there are some such folks in American law enforcement (we have a few on this forum), but they are pretty scarce.
I think it is a real stretch to say that carrying a revolver as your duty weapon is any indicator of skill-at-arms, or lack thereof for that matter.
I am in favor of an officer being able to choose his duty weapon if he/she can demonstrate proficiency and wants to bear the expense, and I love revolvers, but I went to something else as soon as I was allowed.