Yes I know all about "shrinkage" but self-checkouts just feel like some smart arse built a machine which barely replaces the person at the till and sold it to supermarkets as a feature.
Here in Australia, several Coles supermarkets have installed exit gates that track you on camera as you walk through the self checkout area, and if the machine decides you didn’t pay, it will physically close the gate and flash red.
Woolworths also have cameras in front and above each self checkout, and when the machine inevitably decides that the weight of your reusable grocery bag is an attempt to steal something, it will replay the footage from above to the assistant.
I have actually noticed I’m hassled far less by the Aldi self checkouts, they seem to need a lot less operator intervention so I tend to shop there more nowadays.