You are quite right about lost knowledge. I grew up in the '60s and '70s in the south. In that time and place, real men fixed their own car. I cannot think of even one man I met as a child who didn't know how to fix a car. I know there are households that don't have so much as a screwdriver, but it still seems very strange to me.
Even more fundamentally, more and more households have nobody that even knows the basics of cooking. Everything they eat comes in a box that goes in the microwave. That seems even more strange to me. Considering we all have to eat every day, I would think that knowledge would be important to people.