China has millions of surplus military aged males. When the next big shooting war happens that will make a huge difference because they can afford to take huge casualties that other nations cannot absorb. Numerical superiority is an often overlooked military tactic
To maintain the population, China needs those young men to be home raising families, not just being cannon fodder. The communist government screwed the pooch years ago with their 1 child policy. They apparently never thought that people would kill off their baby girls in order to have a son.
