> paint China as a good alternative.

I don't think OP is doing this, just stating the obvious. The invitation implies $$$ but not naturalization.

> If you want to live in a country, you might want to actually be a citizen of that country. Does that need explaining?

Yeah might, so it is big question depending on the situation, and even bigger once you got more passports or permanent residence. For example people intentionally avoid US permanent residence or citizenship for global taxation.

> Are you seriously suggesting that people can literally just not engage at all with the society they live in?

All the time, especially the US expats in China. They tend to live in nice communities for foreigners in a few tier-1 cities, they go to western style international hospitals and their kids goes to fancy international schools. Basically employers have everything prepared nicely for them, hence the contrast of China between foreigners and citizens.

In terms of racism in China or east Asia as a whole, there is practically no problem for white ppl, small problem for indians, big problem for blacks.

In the reverse direction in the US there are Chinese/Latino spending their lives in their own ethnic community without speaking English at all, it is not that uncommon, just invisible.