The difference between an oil field and a chip fab is that the equipment is more easily destroyed in a chip fab, vs a hole for an oil well. Not to mention that expertise in human capital required for chip fab is way higher than that of an oil field.

Even a successful invasion of taiwan guarantees either the people important to the fab will leave, and the equipment evacuated, or destroyed if unable to evacuate.

As Saddam’s Iraq unfortunately proved when invading Kuwait, it is really easy to destroy oil fields, and much harder to clean up the damage. I can’t see much difference between that and destroying chip fabs.