Totally agree that it’s a sound strategy to keep their latest and greatest on home soil. At the same time they are starting to implement tooling for important parts of clients designs like

Core chiplets for Ryzen

iPhone SOCs

https://www.pcgamer.com/hardware/gaming-monitors/amd-is-now-reportedly-making-all-american-ryzen-9000-cpu-dies-at-tsmcs-arizona-fab/

I wouldn’t say 5nm and 3nm are low end

https://pr.tsmc.com/english/news/2977

https://www.tomshardware.com/tech-industry/tsmcs-arizona-fab-21-mass-produces-4nm-chips-at-a-higher-price-than-taiwan