I thought I’d already commented in this thread but I guess not. I took a different tack in my consideration of this mental challenge. If “the Powers that Be” announced they would make S&W revolvers to their old high standards of fit, function and finish, but that they would only make one frame size, my vote without question would be for the K frame. This is the best size for many purposes and still useful for most (except the very largest calibers, of course.) When you consider the K22 and the Model 19 with various grip iterations and barrel configurations, and everything in between these two, the choice of frames is obvious.
Yes, I still love my Baby Chiefs Special and my 8 3/8” Model 29, but you did limit me to one frame size, didn’t you?
Froggie