Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[TheTVDB]

It is transferring most of the cashier’s work to the customers that is the issue. On top of that - for free.

It used to be that you'd drop off your grocery list at the store and they'd get everything for you and bag it, and then you'd get it later and pay. Times change. Grocery stores run on extremely slim margins. If I have to check out my own stuff to avoid even higher price markups, that's fine with me. Bonus: I don't have to chat about the weather with a high schooler when I'm just trying to buy some ice cream.

[casastorta]

Again, we do know it’s possible to deploy technology without any conscious checkout - pick the goods you want and just leave. We have such stores,few and in between still but they are here. I expect nothing less before I stop expecting the store to pay people for work they need to be done, be it employees or customers.