A lot of people here go shopping by car for a whole week as well and we also have people living in areas where the next shopping isn’t in walking distance. And it still works just fine. It’s really easy because of course you don’t have to stand in front of the checkout the whole time but can already bag stuff. As long as you can bag your groceries as fast as they are being scanned it’s really no big problem. And if you’re a 90 year old granny who isn’t as fast, they still can bag their groceries while the next costumer is being processed since the packaging area is usually divided into two sections.

I’m really sorry, but the US didn’t invent some special kind of super grocery shopping which no other country can understand. You just like the convenience of not bagging your stuff yourself. It’s really not some top secret technique to make shopping 150% more efficient or something.