Self check-out machines aren't automation.

There used to be two humans standing at the cash register, now because of software, automatic change machines, and cameras there is only one. One of those humans' jobs got automated.

Call it what you like but replacing the work of humans one for one is difficult and usually not necessary. Reformulating the problem to one that machines can solve is basically the whole game. You don't need a robot front desk worker to greet you, you just need a tablet to do your check in.

I do their work. No work got automated.

This. And I do their work a lot more slowly because it's not my regular job, and I actually already had to do some of the work (getting the items out of my trolley and onto the conveyor). Now I stand there forever fumbling with barcodes, trying to get bags to stay open, switching between getting items out of the trolley and scanning. The old checkout system is so much more efficient when you are buying anything more than a couple of items at a time.

Yeah this is like saying Aldi “automated” cart return. They didn’t, they got every shopper to do the work themselves. Automated cart return would be if you just gave the cart a little “giddyup!” when you were done and it found its way home. Or those cart conveyor belts at Ikea, it’s only part of the process but that part is automated.

[edit] Aldi did automate the management of getting shoppers to do that work, because there’s not a person standing there taking and handing out quarters, but (very simple) machines. Without those machines they might need a person, so that hypothetical role (the existence of which might make the whole scheme uneconomical) is automated. But they didn’t automate cart return, all that work’s still being done by people.

Do you consider all forms of "self-service" to not be automation of a job that previously required an additional human?

Like checking in at the airport via kiosk/app for example. Do you consider that to be "doing the work" of the desk clerk? Or say ordering at a restaurant by scanning a QR code, in both cases I have to look at the menu, decide what I want, and input my order into a system. But with the QR code there's no longer a human necessary.

Many "productivity improvements" in the modern era are just externalizing the problem. It's like saying I automated recycling by dumping all my unsorted stuff in my neighbors bin.

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