No, my assumption is that a war would leave Taiwan scorched and useless to anyone. "a) mostly independent because it produces a lot of technology domestically"

No, my assumption is that a war would leave Taiwan scorched and useless to anyone. "a) mostly independent because it produces a lot of technology domestically" would ensure that China doesn't suffer from the lack of availability due to this destruction, and "b) the next-in-line for supplying the tech to the world if the current main supplier disappears" would ensure China profits. That assumes these two assumptions are actually true.