1. Smart STEM people are more inclined to having a family. Constant uncertainty is not conducive to family. That will cause a lot of smart people to be sea turtles.
2. The most significant drawback of smart people congregating elsewhere is that future American companies are fucked. There is just going to be a lot more competition for products globally. Future Apple will have to fight Chinese companies in India. Mariott will have to fight Oyo in China. Future Tesla will have to fight BYD in Europe.
A LOT of our stock wealth is because other companies couldn't innovate as rapidly because the US was draining those countries of this talent pool. With this reversal, American companies will have a smaller pool of talent and will get whacked everywhere. Its super unfortunate.