I emphatically disagree with you.
Manual Labor builds strength and conviction of character required to have a civil, polite society.
85% of the kids going to college have NO BUSINESS being there... every Doctor, Lawyer, Politician, Engineer, Computer Programmer, and what have you should spend their formative years digging ditches and breaking big rocks into little rocks with a sledgehammer.
Hell, most of the Politicians can just throw on some orange jumpsuits and leg shackles and get started RIGHT NOW.
That may be, but productivity is the measure of output divided by input. Higher productivity is achieved mostly through mechanical inputs. For example, people for the most part no longer harvest wheat with a sickle, they use combines.
The reason that we enjoy a high standard of living is the increased productivity enabled by mechanization. It's a good thing.