In what state can you not use a 50 BMG for hunting? It's legal around here, why wouldn't it be?
I am 100% against "shotgun only" areas. They are dumb no matter how you cut it. First of all, half the "shotgun only" areas don't even let you use buckshot, so really it is slug only. Maybe back in 1962 that meant something, but now in 2021, it's a joke. Shotguns and slugs have at least doubled their range, more like tripled, and every "shotgun only" area I know of also allows "handguns" which include the TC Encore and Contender. You can legally shoot an 18" barrel Encore in 308 winchester, as long as it has a pistol grip. It's kind of ungainly, but such a setup still can shoot accurately out to 300 yards, more if you practiced. I want to see every "shotgun only" zone eliminated completely, as well as allowing buckshot in shotguns.
Your argument is ridiculous. Muzzleloader seasons have not been reduced as new cheaper guns have been developed, they have only been increased. Muzzleloader season is no different than bow season in their purpose. Bow seasons as well have only expanded since compound's have came into use. If anything, an inline muzzleloader has more in common with a flintlock, than a compound bow does with a longbow.