China has a very sophisticated manufacturing industry there, no doubt the best in the world. It will take a long time to build up the infrastructure of multiple

China has a very sophisticated manufacturing industry there, no doubt the best in the world. It will take a long time to build up the infrastructure of multiple manufacturing engineers in other places, just like the bay area and other places like Seattle have a lot of 'intellectual infrastructure' that companies can hire from. Apple could do this kind of stuff in the US, but it would cost more, at least in the next few years, to establish those kinds of capabilities in the US.