These options - self-service checkouts, etc - are convenient, sure, if you only have a few items.
I don't believe though that customer convenience is the prime motive for introducing them - but of course that is how they are 'sold' to the public.
Competition is fierce in food, manufacturing, industry, etc and, as Sainsbury's says, "every little helps". Every penny they can shave off the running costs, every human being they can not have to employ, makes them more competitive. That's the bottom line.
Artificial Intelligence is taking over from human beings, 'bots' are already answering your "frequently asked questions" on various sites... which is why you spend inordinate amounts of time on the 'phone waiting to speak to an overworked (and possibly poorly-paid) 'operator' who has had to be employed to answer the more complex issues that the bot can't.
Friend of mine, late 80s, has to travel miles to a town - by taxi, there is no public transport, to attend a class instructing the use of a specific piece of medical equipment used by her DH. The use of this equipment used to be overseen by a visiting nurse - and that service from the NHS is "no longer available". If you are wealthy of course, you could hire a private nurse, but that's an option mostly beyond the purse of the average citizen.
I'm just waiting for the day when your NHS dentist (are there any left?) hands you a phial of Lidocaine, dental pliers, and an instruction manual on how to remove your infected tooth
.
My OH's podiatrist chatted to him the other day about the dwindling services offered on the NHS to elderly patients - some like my OH with diabetes - apparently even being blind does not automatically enrol you for such services. You will be asked if there is a reliable 'friend' who can cut your toenails if you can't actually see them, if you have no family able to perform the task!
The problem with automation is that if it 'goes down' - everything grinds to a halt, and because everything's online and automated, there's very few humans who can take over. You can paralyse a country through a cyber-attack - damage their economy. Doing it all online is convenient and saves time for the average individual - until there's an outage, and then it's chaos.
The bottom line in business and in public services is all about cost-cutting. But I think we should fight to keep humanoids employed as much as possible - oh, and keep cash as a reserve option!