The argument sits on the definition of "Primitive." Are bows and muzzleloaders, inherently primitive? They must not be, due to the fact there are muzzleloader seasons and there are Primitive Muzzleloader seasons.
There is an archery or bow season, but not a primitive bow season. That doesn't mean bows are inherently primitive. One could argue a standard recurve bow would be primitive versus a compound bow. The projectiles (arrows and arrowheads) would or should be primitive as well, to stay inline with the theme.
The same is true with muzzleloaders. There is a muzzleloader season and in some states, a primitive muzzleloader season. The primitive firearm, in most states with one, is a flintlock, with open sights. The projectiles in the primitive season, should be lead only, patched round balls or bullets.
That seems simple, but obviously it isn't.