Comment by maxglute
IIRC morris chang indicated US operated fabs would cost ~50% higher, which is not cost competitive, well not something buyers would sign for without something happening behind the scenes (i.e. US gov pushes Nvidia and Apple to use Intel foundries). If A16 is $100 from TSMC TW, it's $150 from TMSC US, presumably $50 to BOM is something Apple can afford, but most others might not. List of companies who are willing to source at 50% limited (unless incentives).
Some of that has to be offset by shipping, importing fees, etc. But I do think the end goal is to get Apple/Nvidia/etc back on US soil manufacturing wise.