That's not how it used to work. That's still not how it works in my country. I buy my bread from a specialized shop, my cheese from another, and my fresh produce from yet another. I know people who only buy their meat from a butcher (I do it sometimes, but not always).

I understand your point of view. But in cities of all sizes, it's easier to not have to do that. For example in NYC, a medium size city, you can easily go do your shopping in multiple places, and not at the same time.