I'd disagree with your point about effective nagging. A human might get the message, particularly if they know you. An automated checkout never will, every transaction is identical.

Obviously my perspective is very "bah humbug". However, there are several major issues in modern western societies, including social isolation, spiralling cost of living, and the ongoing death of the highstreet. I see automated checkouts as another nail in the coffin. Melodramatic perhaps, but there it is. I'd happily exchange an automated supermarket for a string of corner shops run by flawed humans.