American science to soon face its largest brain drain in history

This is good for the world. Hyper concentration of talent reduces diversity.

Diversity of what (identity or thought), who, and/or where?

Silicon Valley, the population of ordinary people residing there, 10 years ago (2015), heaved diversity. In corporate employment, it took decades to break through gender and race ceilings in industry to various degrees, but it largely happened, mostly, for better or worse.

Bringing together people, capital, opportunity, and academia creates a vibrant ecosystem that mutually reinforces further gains in a "virtuous" cycle. What doesn't create much is having only a few people spread out without a support system. It takes encouraging a mix of many open minded people within a smaller physical or digital proximity in order to get the w00w00 effect. That can't really happen when people are told they're not welcome.

Counterpoint: concentration of talent is incredibly valuable for humankind.

They're concentrating in China. It's just that the US won't be that location of talent.

> Silicon Valley, the population of ordinary people residing there, 10 years ago (2015), heaved diversity. In corporate employment, it took decades to break through gender and race ceilings in industry to various degrees, but it largely happened, mostly, for better or worse.

What's the meaning of "heaved diversity" here?

I think I agree with the rest of your comment, about the concentration of varied talent being important.

Are you arguing that prior to 2015 there was no diversity in Silicon Valley?

The economic concept of economies of scale dictates that the more researchers there are in one location, the more efficiently they are likely able to research.

Good, China needs talent not wasted on optimizing a police state.

It also destabilizes areas with brain drain resulting in economic destruction and mass migration (one of the factors destroying Europe).