The distributed and outsourced supply chain is not the problem. Look at Airbus they do it this way since 40 years. Boeing simply tried to copy but failed, because they missed the most important point: “You can outsource manufacturing and assembly but you never ever outsource engineering.”
True
The F-16 was produced worldwide with various sections of the airframe, wing, and cockpit divided among several nations tightly with tight coordination. It was slow and difficult intially - but eventually picked up working out the bugs and surpassed 2000 units.
=8-)