The fundamental problem with this is that, as technology becomes more advanced, the facilities required to make it have become more complex and dependent on cen

The fundamental problem with this is that, as technology becomes more advanced, the facilities required to make it have become more complex and dependent on centralized manufacturing. For example, the cost of a fab capable of building even reasonably modern ICs is in the billions and there are a handful of companies that have the ability to run them, and they rely on equipment from a number of equally specialised suppliers.