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Despite the higher male-to-female ratio, China still has higher marriage rates than the countries of the West, so it doesn't matter (this is not a problem for anything).
So, even in more gender-balanced societies, women simply don't care about getting married more and more, it doesn't matter whether there is a hypothetical balance, at the end of the day, or not when no one ever reaches that ceiling anyways.
"One child policy" is a non-factor for any kind of serious discussion. If you don't get this is a cultural issue, you are an idiot. Did Japan and SK have "OnE cHiLd PoLiCy"???
In the link above, East Asians have even higher marriage rates than Westerns, but fewer children, what does that tell you? They simply prefer to invest more in their already existing children (so they perform as best as possible), then to make more of them. This is their evolutionary psychology strategy for colder climates.
They are also smarter and can understand more or less upfront all the long-term costs of raising more and more children than blindly venturing into all of that like some other populations. If you don't read about anthropology and evolutionary psychology, you can't realize anything.