Even in Nordic gay space communist countries where all the needs of mothers are provided by the state, there is a birth rate crisis (met with immigration).
I think many of us uncomfortable with the dawning reality that achieving the replacement rate of humanity requires oppression of women. Bearing children is an enormous pain in the ass and without pressuring and grooming women into it, we don't get to the maintenance target of 2.1 babies per woman.
There are probably ways societies could THEORETICALLY adjust to make child-bearing more emotionally attractive without social coercion, but, fuck, man, society can't even maintain platonic friendships these days, how are we going to figure out how to have every woman average 2.1 babies?