> They have also been expanding outside China-Taiwan, distributing their capacity and developing support in the USA and Europe. Worst case (actual shooting war between China and Taiwan) they would have a lot to fall back on.

Very unlikely. In case of a shooting war, the industry will run out of consumables sooner, or later. As a fact, 90%+ of them come from the Taiwan/Japan/Korea triangle, and just any military move in the region will be effectively shutting the industry down globally.