I have seen this statement and am mystified. How much accuracy are you going to lose on a 2" revolver? How much velocity? Does it really make much of a difference?
Honestly in looking at it, I cannot see why someone would want a .357 snub. They are more expensive than the .38 versions, are harder to shoot, less accurate, and probably not as durable. The experience with snub .38s is probably close to a hundred years. The experience with the Colt "Dick" is 75 years, the S&W Centennial models 50 years. That is a long time. And those guns have proven their value over and over. If I were looking to upgrade snub performance I would be looking for a .44spc.