War also ruins infrastructure and housing. To regenerate the population, you first need to regenerate the infrastructure. That diverts resources from other tasks. And when large part of your working population is dead or crippled due to wounds, that is especially hard. IIRC, after WW2, Russians had to employ women at traditionally male professions, and not out of feminist sentiments. Basically WW2 thrown Russia back several decades. Just like the revolution.