In a classless stateless utopia where food was free and no one had to work it would still be considered polite and common courtesy to put away your shopping cart when you're done using it at the local food co-op.

The floor shitting analogy is that we shouldn't have people doing something rude just because it creates or maintains another job. Everyone can agree on the floor shitting analogy and it maps perfectly onto this argument. If you want you can add a preamble of "in this world, everyone used to shit on floors and there was a janitorial staff to clean it up."

They put on self-service tills in the hope that folk would do it free. When they used to hire 30 checkout staff, they now hire 2 per 12 tills, so they save on 20 checkout staff per shift. Of course they weren't redeployed to shelf stacking, as they already had shelf stackers. They just went to the job centre.

So by this logic you want gas station attendants back at gas stations, and for people to stop using ATM machines in favor of tellers? Maybe we shouldn't use computers because of all of the stenography and data management jobs that were lost, not to mention all of the paper mills that were shut down as people moved away from using so much paper. As you see, jobs appear and disappear all the time. Why do you want people doing meaningless redundant jobs for the sake of their employment? That's just cruel.

Maybe we should bring back the lamplighter guild and get back to using horses. Gas lights and carriages created a lot of jobs that were rudely snuffed out.