The scan as you shop systems that I am referring to are where you are given a little barcode scanner with a display, and you go around the shop scanning your items as you pack them. At the end of the shopping trip, you still go to the self checkout machine, but you just transfer your scan list from the portable barcode scanner to the till. At no point are you using a phone camera to scan items. Usually the trolleys have a little mount point for the scanner so you don't even need to touch anything.

I agree that having to scan out via the anti theft barriers is idiotic.