China's leadership disagree with you. China actively sponsors Africans to study in Chinese universities.
And please dont be racist towards Africans. These people have been let down from their failed governments and from Western Colonialism. In these poor countries, the people who are the brightest are tough people who survived in this environment.
And I didnt say that China should follow the EU's model (failed), neither the US' model (working sometimes, failing other times)...
China should create its own model for attracting top foreign talent. They could first offer them, a 15 years resident permit, and then allow them to take difficult tests, on political system, cultural norms etc.
China can create its own immigration model, there is no reason to follow EU and the US.
The people entering EU and the US are mostly the bottom of the society which is why they are failing. China should strive only for excellence and for following its own culture not importing culture from other countries