TSMC is starting A16 mass production this year. Its 2nm process entered mass production in their domestic fabs in 2025.

In other words: TSMC Arizona isn't SOTA - it is lagging 3 years (~1.5 nodes) behind.

Taiwan isn't stupid. It knows that keeping SOTA domestically is the only way it can rely on the US for protection. The second their fabs aren't absolutely crucial for cutting-edge chips anymore, the US will drop them like a brick - and China will happily devour the country.