I know the rhetoric is appealing, but as a Chinese national myself, I have not seen a single STEM person who has left the US for China because of immigration reasons. On the contrary there are plenty of them that have gone to China after securing a US green card.

If competing with China for talent is the goal, easeness of doing business and more early stage VC funding - a la “back to 2015” - can help, but it’s not clear those are the right things to do.