Also where did they get the money to start out. Land, buildings etc. And to read hacker news a screen, an internet connection, all of which made, by specialist people using specialist tools, made by other specialist people using specialist tools. All of which were developed by specialist people relying on other specialist people.

Philosophically I like the idea of being a generalist. It's good to know. at least rudimentarily how to build simple things and look after yourself. But lets not kid ourselves, if we all did this we'd be back to the stone/iron age.