Which translates into the customer paying less, assuming you have proper competition where the customer can choose the store next door (all shopping centres in my city have that - two competing stores that sell exactly the same products - so they have to compete on price).
they’re told that customers love it.
A lot of customers do love it. The ones that don’t can still use regular checkout. Or just ask for help at the self checkout.
It’s really not that hard, scan barcode, put in bag. Occasionally put an item on the scales and select from tomato or red apple on the touch screen. What’s difficult about that?