Earlier quoted context omitted.
You can't, because that work can't be done here economically, we've moved further up the value chain. On the flip side, let's say you want to manufacture a new custom processor for your ipad competitor, or turbine for your new 787 competitor. You won't get those things in China, at least not without significant involvement from US companies.
"You can't, because that work can't be done here economically, we've moved further up the value chain." Fundamentally I don't believe that. I could just be stupid. I see the automation that is possible in the US, the infrastructure, and you tell me that its not possible for someone to make a business out of assembling things? Sure its cheap to pull 10 dextrous laborers out of the Chinese working class and make an ass…
I am not an economist or a business guy - I move bits for a living. But I'll take a stab at it.
what prevents a technologically sophisticated engineer from doing the same with one robot workstation and some programming?
I think that, right now, there ain't no such automation that can deliver what you want at a price/time you'll be willing to live with.
I've seen demos of such. Give it 10 years and you'll be able to custom order anything you can design, and that is legal.
Quasi-legal items ... well that's what your basement is for.