Quesadillas aren’t really Mexican. It’s just cheese an stuff on a thin flour disk. You can call them cheese crisps if you want.
Whatever. They’re intended to be “Mexican” - same old corn tortilla, and cheese and a bunch of other tasteless garbage.
That’s like saying corn beef and cabbage isn’t Irish - it isn’t - except it has become so by Irish-American standards, intended as such, and everyone thinks it. We know what it is supposed to represent.