Here in Brooklyn, nachos involve at least chips and melted cheese. That's the economy version. A deluxe variety can also include refried beans, salsa, sour cream and perhaps even chili meat. A good plate of nachos can be a whole meal.
I'd be puzzled if someone said they were bringing nachos and showed up with only a bag of chips.
Yeah, nachos, at minimum, are chips topped with cheese. They have misunderstood the meaning if they think it just means chips. "Chips" just means chips.
noun, plural na·chos. Mexican Cookery.
a snack or appetizer consisting of a small piece of tortilla topped with cheese, hot peppers, etc., and broiled.
Since I was the first to post this thing about nachos just being chips, and this is the regional sayings thread, I think it's pretty clear that what's "wrong" everywhere else is reasonably easily understood in PA.
The first time I made nachos, as we understand them, for my PA-reared husband, he said something like, "I didn't know you meant fancy
nachos! Wow!" When his mom serves "nachos" for a snack, it's chips and salsa or another dip.