China would like the fabs but it's not the fabs that drives them to re-unify with Taiwan. That desire pre-dates the fabs by decades.

No, but trivial to shutdown fabs by destroying power infra down the chain. Capturing fabs that run on sanctionable supply chains to get look at hardware is secondary to PRC preserving fabs as barginning chip to restart semi production once countdown to western hightech industrial collapse starts ticking.