Earlier quoted context omitted.
I might be a hopeless optimist, but I don't think a USN/USAF/USMC vs PLAAF in SCS/Taiwan situation would escalate to nukes. At least, I don't think it's likely . Definitely a nonzero chance, maybe a coin toss, but Taiwan isn't core territory for either Power. Invasion, now . . well, there's the magic power that comes with having 'em. No one invades you, ever. Also,outside factors could change the math here, like a me…
But that only means that the US would give up on Taiwan before the fight would get any serious (from USA's point of view). I also kind of doubt that China is going to try, at least in the next decade or so, because those so far irreplaceable chip factories are almost certainly booby trapped and are a critical piece of the global economy, so China would be sabotaging itself first. (And Xi has probably a long way to go…
An invasion of Taiwan would probably effectively destroy globalisation, China exports would be sanctioned, China imports of energy and raw materials would be heavily disrupted (China's supply of fossil fuels is very vulnerable). It would be the most disruptive event to the world order since WW2.
The chip fabs are a line item among thousands on that bill.