Actually as a consumer I prefer self check out. I am much quicker and it is more efficient because now you can have many of these tills in the same area that only a few would have fit, resulting in much faster experience than waiting in queues.

That experience aside, I don't believe there should be jobs where you simply don't think. Manual labour jobs are unfair because they don't reward the brain whatsoever, no creativity, no one loves to do them, and they create a market of labourers with little to no transferable skills thus putting them in an unfair situation if they want or are forced to get a different job.