I think that's a weak argument. Apple doesn't make the profits cause it builds iPhones in California. It does so because it chose the Eastern shores for a strategic reason. If your aim is to go cheaper, then to not take advantage of global-trade is really going to set one back by a significant margin. But I understand that Elon Musk is a patriotic South African who wants to create jobs for South Africans, in South Africa... oh, wait, I meant, the United States.

It's not possible to outsource spacecraft manufacturing because it's considered a weapons technology. You have to optimize at home instead.

American satellites aren't even allowed to launch from Chinese rockets.