I'd assume TSMC chose the practical optimum there: given current events, having all leading fans physically in Taiwan was no longer a tenable option. So they r

I'd assume TSMC chose the practical optimum there: given current events, having all leading fans physically in Taiwan was no longer a tenable option. So they re-balanced for a volume play. If some (read: national security volume) fabs in EU / US are enough to assuage governments, but most (read: global economically important volume) are still in Taiwan, then that's the next best thing.