As a counter-example, my great-grandfather, Morris William Travers, was the first director of the Indian Institute of Sciences in Bangalore and I gather that he said that he had to design the engineering curriculum there with a significant emphasis on learning how to use things like screw drivers and wrenches because the upper-caste Hindus were not familiar with these details of manual labor.

So I don't think that you can discount the cultural factors for our familiarity with hand tools. Certainly even in India, even in 1906, you wouldn't have had to teach a repair man how to use a wrench. But you would have to teach the engineering student. That's a bit of a humbling thought.