The crucial side-effect of most productivity-increasing inventions is marginalization of most of the work force (barring the few lucky ones - the SV engineers in the case of XXI century), destruction of communities and concentration of wealth and power in fewer hands. The luddites were definitely onto something. Wendell Bell explored these ideas in detail in his writing, if anyone is interested in learning more.

Yeah which is why it's stated as a problem to be solved, not some immutable fact of life. The issue is that we've seen incredibly little progress in this area. There have been studies on the British coal mines that shuttered under Thatcher - the areas are still not back to the level of employment they had before the mines were shut. It's fine to say that shuttering those mines was a good thing - it probably was. It's also factual to say that those who felt the negative effects didn't benefit from the advantages of government policy, and ina human sense beyond employment numbers it means a lot of those people never worked again.

If you mean force others to take care of the stable boy, then no, it can not be moral.

What is moral and also efficient and kind is not standing in the way of him finding another occupation - to remove all regulation that hinders someone from providing value