It's a popular narrative that Taiwan can deter an invasion by having their fabs rigged to blow up and thereby depriving China of that resource. But China would want to take Taiwan and terminate the ROC government even if the island were an underdeveloped backwater with nothing of value because it represents a bastion of resistance to the CCP, a hold out from their civil war. Party prestige, not resources.

Furthermore, America has been invested in the defense of Taiwan for far longer than the chips have been involved. America needs to remain committed to Taiwan if it wants other countries, particularly Japan and South Korea, to take America's support seriously. Reputation, not resources.