China’s pool is smaller than it seems. China has pursued a development trajectory that focuses on the leading provinces first. That is reasonable. Better to get Beijing and a few other key places to the leading edge first, instead of trying to incrementally move all 1.4 billion people together at the same pace.

But the flip side of that is that China’s talent pool is a lot smaller, in practice, than 1.4 billion. Because vast swaths of the country are still basically the third world. Tellingly, China does not participate in the international PISA assessment across the whole country: https://www.milkenreview.org/articles/are-chinas-students-re.... It released scores for four wealthy provinces back in 2018. They were very high, but there’s obviously a reason China doesn’t test and publish scores for the whole country.