All of that is correct, particularly the part about the die-hards versus the progressives. I suspect that conflict plays out in all armies at one time or another. I also suspect that one generation's progressives are the next generation's die-hards.
Generally the same thing played out in European armies, particularly those that actually went to war.
Winchester repeating rifles, their lever actions, did see some military use and they did market a so-called musket version that came full stocked. I believe some Winchester lever actions were used in the Russo-Turkish war by the Turks. Mostly, however, it was the day of the single shot rifle and they continued to be used into the First World War in some of African campaigns. There were even new designs introduced and manufactured after repeating bolt actions had become the standard.
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.