If you're already in the store, the option to buy your stuff with the equivalent of going online and buying everything from your house, should NOT be an option.
It would be like walking to a restaurant, and then calling that same restaurant to make a reservation.
This has nothing to do with "Maaaaaaah, those damn millennial are too damn lazy! Bah-humbug!", it's about uneeded extravagance. Not everything should require a phone app.
are you handicapped or can you not read, the technology detailed in the OP is a phone app that allows you to scan and checkout items in store, not full on browse stuff like amazon.
it allows for people to walk in the store, scan stuff as they shop, then instantly check out and leave.
if you don't see the obvious advantage of this you are actually braindead or would prefer to sit behind 4 people with 600 items to scan at a cash register. This is an acceptable use for a phone app.
There are examples where phone apps are useless though, like smart fridges or that loving juicer thing that needed an app to work, but those are not the same as what is outlined in the OP
