First of all, we mass migrated a long long time ago before the Neolithic revolution, second of all we didnt have a mass extinction event because we were suddenly able to put seeds in the ground and make them food, and third of all I dont know of any mass megafauna extinction early on in the Neolithic period
Both societies practice arranged marriages. Women have no say in the matter. A lot of times, it is not out of love but for
other reasons that would benefit both families.
The difference is women in China have better chances than women in
India.