TrentonDog, like me is from New Jersey and is familiar with popular regional foods here like hot dogs, cheesesteaks, pizza, pork roll, etc. I think the question is whether you can consider a certain regional food authentic or not. Authentic may not be good, inauthentic may not be bad.
You can do whatever you want to a cheesesteak; just don't add swiss or linberger to it and cal lit an authentic Philly style cheesesteak. It ain't. One made like they do in Philly with cheese wiz added is authentic. You may or may not like it, but it is Philly style. I happen to love wiz on my steaks. I only tried it a few years ago to see what it would be like since it's so popular in Philly; especially at Pat's, who invented the cheesesteak.
People outside of North Jersey make what they call an Italian Hot Dog. It doesn't even come close to resembling a traditional Newark style Italian Hot Dog.
Davydd is the person on this board who is the expert on Pork Tenderloin sandwiches. I'm sure outside of the midwest someone somewhere has made a sandwich and called it a Pork tenderloin. And Davydd would probably laugh and say it isn't real or authentic. I remember him correcting someone and saying what they thought was a pork tenderloin sandwich was not because they used something other than pork tenderloin. Walleye? or something similar?
The point I'm making is that when something is a popular regional food, there is a sort of pride that comes with it from the people who make and enjoy the food. People take seriously what they like and what matters to them. You can think outside the box or innovate all you want. But if you do that, then call it your take on a cheesesteak, or Italian Hot Dog, or a pork tenderloin sandwich. Don't try to redefine something that was created by someone else and has stood the test of time.