Don't know why we are trying to make the simple rules more complicated to accommodate a bunch of variables.
As the "Modern Day Stock Rules" are currently proposed there are now a plethora of available markers that will fit within the definitions of a modern stock class marker. If your particular favorite marker does not fit within these guidelines it is not considered a stock class marker, maybe it is considered an open class pump. No biggie. Play open class pump games, or modify your marker to fit the guidelines, or choose a different marker for stock class games.
Either play stock class or don't, but try to keep the rules simple (as proposed) so all the endless debate and seeking exceptions can end and the "modern era" of stock class pump can move forward. Otherwise we are just continuing the decades long "discussions" and I don't think that was Carter's intent.