Here in PA, I can't tell you how many times I have heard "you can't kill a deer with a flintlock". Many believe they are too unreliable and too inaccurate. I wonder how they think it was done 200 years ago.
Our late season is limited to flintlocks, no percussion guns. There is also an early antlerless muzzleloader season in October when any type of muzzleloader can be used, commonly referred to as "in-line" season, and as you might expect the in-lines are far more popular. There used to only be the flintlock season, and the Game Commission's intent of that was to provide for a primitive hunting experience. From my prospective, the "in-line" season is a *******ization of the original intent in which the Game Commission succumbed to lobbying pressure by the gun manufacturers by providing a technicality to allow modern firearms (in-lines) to be used instead, which was also justified as a way to increase license sales.
I'm just glad that the in-lines haven't encroached upon our late primitive season, but I fear that day may come as the Game Commission continues to look for ways to reverse the trend in declining license sales.
But for now the positive part is that the few of us who are dedicated to using our flintlocks (and know how to kill deer with them) have the woods to ourselves for two and half weeks after Christmas each year.