I feel like a lot of retail should function similar to this way. Stores with shelves of homogenous "stock" is basically asking your customers to navigate a big warehouse while carrying around all their intended purchases; then go stand in a line to pay for those items. They could often easily function as big vending machines. Some stores could be reduced to a few shelves/aisles of 1-sample-per-SKU, where you just scan the barcode from your phone and all your items get sent to you. Preferably not one at a time and not right to the customer, I'd make it where the customer just goes and collects their bagged/carted items when done scanning. The payment could occur at the same time.

Using a grocery store as an example. I'm not a fan of shopping on my phone for some things like groceries. I like to look at the boxes and visually scan the shelves and see things I might not think to search for on my phone. This would allow for it but remove the need to walk up and down 30 aisles. I would still want to pick my produce/meat so this would require a slightly different approach, but the dry goods and other stuff that's typically in center of the store could work.