They’re only good if they pass the savings of not having to pay a person to ring up your groceries onto you

I'm with the other person on this one. Self checkouts have really reduced the queues where I live. They're much more compact than the cash registers and the shop near me basically doubled its cash register capacity because of them. I rarely have to wait in a queue these days.

Tesco even has a scan as you shop service which is really convenient. You get a barcode scanner before you start shopping, then scan all products you want to buy and place them directly in your bags. At the checkout, you scan a barcode attached to the checkout machine, it prompts you to pay, you pay and leave. All your things are already bagged.