[Qwertystop]

A little easier? Seems to me it would make theft a lot easier; it removes the requirement that everything you're buying has to come out of the bag and in front of a cashier.

Self-checkout still requires things to come out of your bag, so the person who's there for when a self-checkout machine inevitably needs cashier assistance can be keeping an eye on several stations at a time.

With scan-and-go, those eyes need to be moved to the shelves, which is a much larger area and won't all be in one person's line-of-sight at once (and the person can easily obscure vision of the shelf).

[CobrastanJorji]

Also makes accidental theft much easier. I grocery shop with my kids, and I pretty regularly end up handing something weird or an unexpected bag of candy back to the checkout person.

[tinus_hn]

If the store is in a community where theft is not that common you can combat it well enough using heuristics, random checks and strong punishments.