China doesn't need to trample Taiwan, they can simply afford to hire the best engineers out of TSMC at 2.5x pay because Chinese companies are backed directly by the Chinese government and can afford to throw tons of money at this problem.

https://asia.nikkei.com/Business/China-tech/China-hires-over...

I'm sure not all engineers at TSMC are willing to relocate from Taiwan to China but pretty much everything is for sale if the price is high enough.