Sure but you seem to ignore that we don't exist in a socialist society.
Cashiers may have an undesirable job and self-checkout may distribute this undesirable labor among the many instead of burdening a single person with it but those people don't get paid for doing that job whereas the cashier did get paid. Self-checkout is also often slower than checkout at a cashier (it has to be because the cashier is trusted to ring up items correctly whereas the customer has a huge incentive to cheat).
The desirability of being a cashier also isn't inherent to the job. It has more to do with attitudes towards the person doing the job, both from customers and from their employer. Service staff often act as a lightning rod for all frustrations and disdain targeted at their place of work, i.e. they frequently get punished for things completely out of their control. They're also often seen as unskilled labor by their employers so they are treated as easy to replace meaning there is very little incentive to invest in their job satisfaction.
In other words, we have systems that not only require people to work even if the jobs they end up doing are undesirable and undervalued but also actively makes certain jobs undesirable by undervaluing them. If you want to change that, you need to change the system that makes those jobs undesirable, not just do away with the undesirable jobs. People seem to have fewer problems grasping this when talking about the virtues of overseas sweatshops (where changing the system is presumed impossible because the implication is that the system arises from a lack of economic development or cultural inferiority).
This is a great additional perspective, but we seem to be mostly in agreement.
I am quite aware (and rather disappointed) we don't live in a more socialist system, but as we seem to be pretty much stuck under particularly nasty version of capitalism at least for the near future. So unless someone finds a way to turn the whole system around any time soon, I still think at least trying to make some of the worst parts of capitalism somewhat less unbearable is a good thing.
Cashiers may have an undesirable job and self-checkout may distribute this undesirable labor among the many instead of burdening a single person with it but those people don't get paid for doing that job whereas the cashier did get paid. Self-checkout is also often slower than checkout at a cashier (it has to be because the cashier is trusted to ring up items correctly whereas the customer has a huge incentive to cheat).
The desirability of being a cashier also isn't inherent to the job. It has more to do with attitudes towards the person doing the job, both from customers and from their employer. Service staff often act as a lightning rod for all frustrations and disdain targeted at their place of work, i.e. they frequently get punished for things completely out of their control. They're also often seen as unskilled labor by their employers so they are treated as easy to replace meaning there is very little incentive to invest in their job satisfaction.
In other words, we have systems that not only require people to work even if the jobs they end up doing are undesirable and undervalued but also actively makes certain jobs undesirable by undervaluing them. If you want to change that, you need to change the system that makes those jobs undesirable, not just do away with the undesirable jobs. People seem to have fewer problems grasping this when talking about the virtues of overseas sweatshops (where changing the system is presumed impossible because the implication is that the system arises from a lack of economic development or cultural inferiority).