I disagree. The problem, if there is one, isn't the guns. It is the expectations of "cast bullet shooters" who aren't casters, just shooters of commercially cast bullets.
the old timers, especially the cast bullet rifle shooters, understood, that you fit the bullet to the gun, not the other way around.
The nominal diameters for each caliber were the starting point, not the end. This is why you see so many different diameters in molds and lubricator sizer dies in each caliber.
It didn't matter what the book said your gun was supposed to be, what mattered was what the gun was, and choosing the right size bullet to properly fit what you had.
So, if you buy a new revolver and don't get exactly what you want from it, using commercially cast bullets of a "standard" size and their choice of alloy & hardness, is the gun at fault? Or did you just buy the wrong bullet for what you've got???
I know how I'd vote...