I think a national security argument is much more sound than an economic one, although costs are externalized in a way that isn't obvious, i.e. ecological disaster that shipping everything around the world and back (components, assemblies) is, and hollowing out a local supply chain takes virtually no time while the impact or limits of it are hidden until abrupt breakage (i.e. covid-era shortages on basic supplies, wars, or heavy handed statesmen dictating preferential access to silicon or whatever today). That is, every nation has to maintain some stake in not hollowing out completely while still participating in global commerce.

Once upon a time nations understood the issues better: https://en.wikipedia.org/wiki/List_of_telephone_switches