The biggest loss of China immigrants is their offspring?

We can see that everyone is discussing the issue of immigration, but few people analyze how much loss immigration will cause to the country.

The losses I can think of at once are as follows:

1. A considerable part of the elites who emigrated abroad are investment immigrants, which is equivalent to investing the money that could have been invested in China abroad.

The next generation of these elites must also have foreign status. Education abroad may be the loss of talents in China.

Not to mention the loss of some immigrants engaged in military research.

That's all I can think of for the time being I hope you can correct me. Thank you.

Note that this topic is not about "why do you want to emigrate", "how to reduce immigration" or "what is the relationship between national loss and individuals".

Immigration is of course personal freedom, and everyone has the right to choose a better life. Now people's more open attitude towards immigrants also proves that the public's thinking is progressing. On the other hand, I think that the migration of ordinary people, from the national level, is not a great loss. After all, if most people exclude cultural and linguistic factors, they will have the idea of immigration if they have the conditions. However, everyone is discussing the question of "how should the China government deal with the brain drain caused by immigration", so I want to know where this brain drain is reflected in the country. Thank you.