For me it’s not the time spent at the checkout that matters, it’s the time spent waiting at the checkout. Also over here cashiers don’t bag your items for you, so you have to do that anyway

Also also, they have these really handy hand scanners over here so I can already bag my items while I’m walking through the store, and then the only thing I have to do at self-checkout is hand in the scanner and pay for the groceries. That is genuinely a lot faster than normal cash register shenanigans.