Intel still knows 14nm quite well, and would likely sell access to the line if asked.
If Taiwan ceased to exist, that would put us a decade back.
If Taiwan ceased to exist, that would put us a decade back.
The gap isn't a decade, more like 12-18 months.
Also, TSMC has 5nm production in the US. There are actual people with know how of this process in the US.
Other companies are using the same equipment (Samsung and Intel) but TSMC has deeper expertise and got more out of the same equipment so far.