I agree that a modern grocer or butcher might wow them, but it's way less given that contemporary supermarkets would.
Those supermarkets are a product of a far more modern and culturally specific consumerism, which is not so innate as you might think. Many of us have been raised into and it's been gradually exported around the world, but it's the food equivalent of free to play MMO -- overstimulating, manipulative, confusing, and in many ways far divorced from the far more universal basics of buying food to cook and eat.
Those supermarkets are a product of a far more modern and culturally specific consumerism, which is not so innate as you might think. Many of us have been raised into and it's been gradually exported around the world, but it's the food equivalent of free to play MMO -- overstimulating, manipulative, confusing, and in many ways far divorced from the far more universal basics of buying food to cook and eat.