Stan,
I seem to have riled up a Pre-Mounting advocate.

Never said that the game should be limited to "casual bird-hunting sporting clays shooters". I'd simply much prefer a game that requires that all of the shooting mechanics had to be mastered, including the gun mount.
Yes. the choice of Pre-Mounting or not, "has nothing to do with what the game of sporting now is". That's the issue. It has simplified the game and made it such that people can now break more targets with less skill.