While not my first choice, I think it has something to offer for people who like to shoot and don’t reload.
I don't. The only thing I can see that it has to offer is to a reloader, because you don't have to hunt for your empties in the weeds.
Now, I can see the point of getting an SA revolver in a caliber you already shoot and reload for, I did. I got a Ruger Blackhawk .45 convertible, so I could plink with .45ACP that I already had, and not have to hunt for my brass.
At the time, I had no experience with the .45 Colt round but I bought a box so I'd have some and to try it out. I made one "small mistake", the first rounds I shot from that Ruger were .45 Colt and it was an eye opening experience, and after that .45acp from that gun just seemed weak. In the 40 years since, that Blackhawk has seen several thousand .45Colt rounds but only about 300 .45acps.
But the Pietta is different. Colt pattern SA firing 9mm Luger. And, only 9mm Luger. Not for me, thanks. There are many other pistols that can fire 9mm Luger and give you a lot more features and useful practicality.
If a 9mm single action revolver is your dream, the Ruger Blackhawk in .,357 with a 9mm cylinder covers it well, has adjustable sights, and the ability to also shoot .357 Magnum and .38 Special.
There are some terms that just don't seem to fit well together, for me, "Cowboy" and "9mm" are in that group, kind of like "Roman Centurion's cell phone". Its just outside the historical and traditional usage, but that's just me.