Honestly, I can't imagine why 9mm revolvers aren't more popular.
.357 is annoying to load. The darn cases are so (needlessly!) long, and the cartridges so nose-heavy, you can't hardly pick up and load more than 2 at a time.
I imagine I could easily grab up 6 or 7 stubby little luger rounds in one fistful, and load with the same hand without dropping any - easily turning around backwards cartridges for proper orientation into the cylinder. I would shoot my .357 so much more, if I had three hands. Going back and forth between pocket and gun 3 times just to reload takes the fun out of it. Then retaining those long empties fills your other pocket up fast! For a cartridge that is so much bigger, you sure don't get much benefit for the extra size (out of a short gun).
With moon clips, you could carry 3 9mm clips in the same space as 2 .357 clips.
Shorter tapered cartridge would be a breeze to eject, even with super stout "Ruger only" loads.
During your speed drills, you wouldn't mind losing or stepping on cheap luger brass.
The cylinder would be much shorter and lighter. A lighter cylinder means less notch peening, lock and timing wear from fast shooting, and cylinder gap issues. And it means a more compact gun. A 1 inch luger snub nose would be more concealable and lighter than a 1/2" inch .38, without using exotic metals. And it would have a full length ejection rod.
9mm revolvers should be putting .38 and .357 snubbies out of business.