China is pretty closed tight, they do less than 1% of the immigration that the US does each year. In fact, in 2022, China only issued a total of 1,576 permanent residency cards, compared to the US’s 1.2 million, or about 1/750th of the US.
I’ve looked into moving to China, it’s not easily done.
China is a closed society dictatorship. They're not attractive to higher educated talented people who have a choice where to immigrate to. It would be good for society as a whole for China to get smaller because of they get too big they will try to conquer a few other countries.
Japan is different and has changed over the last half century. They don't arbitrary detain you or try to be repressive. Society will not lose out if there are more Japanese in the world.
In fact Japan does well with soft power, all my friends love holidaying there and some would even immigrate if the rules were relaxed. Whereas none would go live permanently in china even if they gave out PR on arrival.
Since most governments are filled with people who have way more money than they can spend in a lifetime probably never.
I will never understand why people who live in poverty or barely get by look at some rich CEO/billionaire whatever moneybags person go "yeah this person will probably understand my hardships and make it right, let's make him governor or president".
A lot of politicians are completely out of touch and as long as they're doing well everyone must be doing well (or they simply don't care).