Manufacturing machines are hard to invent, and harder to keep running right, and even harder to network together into an effective factory. You need skilled ope

Manufacturing machines are hard to invent, and harder to keep running right, and even harder to network together into an effective factory. You need skilled operators, technicians, and engineers to design and run a factory. You also need to put down a big whack of capital upfront and will see a return years down the line, hopefully. With low enough wages, it could easily be financially better to rent a big building in the third world and staff it with actual people.