The big problem China faced and why the one-child policy was abandoned after all is that there was a staunch focus on having a male child to “keep the bloodline alive” (cultural reasoning) which led to a stagnation in the 0-14 years age group.

Covid was most deadly for the age group of 65 and above and in 2019, they had proportionally less people aged 65+ than the US (13.50% in China vs. 16.4% in the US). Either China’s scientists failed immensely or the virus stemmed from bad health care practices in livestock markets selling bats.