In the first research around Lucy, the australopithicus fossil skeleton in the 70s, I remember reading the theory there that females for evolutionary reasons including slow maturation, needed to be able to raise more than one child at a time which was the root of monogamous relationships: ie a female's freedom of movement and ability to hunt was limited by having several small children to protect and care for, which meant requiring a helper to leave the group, hunt and bring back resources, and to help with care. Not sure how much that theory has stood up over the past 40 years, it would seem more likely that a group of females together would be better positioned to provide and share care for multiple young than small nuclear families. The social relationship between male and female would seem to be relevant though, the drive from early adolescence is towards a pairing and a strong emotional bond. (Anyone with any suggestions on reading around this enthusiastically welcomed!)
Articles about the dropping birthrate in China talk about how the limiting of one child per family (and a heavy preference/skewing of this to have boys) has produced a generation of men who were very precious and waited upon sons and have grown up expecting a partner to continue the treatment they are used to. However the women of the generation to be those partners have been raised with education, the ability to make their own incomes and lifestyles, and simply don't want to be treated in the way these men wish to treat them, or waste their lives being the carer of a not very pleasant man, being not very well treated. No thanks. Other ways to get pregnant and have children. South Korean women apparently feel the same way.
This is the Incel argument: women have got much too educated, too entitled, and are no longer willing to do their basic duty which is to provide each man with an obedient, serving wife. Whose job is to provide service, care, sex on command, and shut up, while accepting a much lesser right to be happy, make choices, direct their own lives or have their consent respected. Women however basically choose whose genes make it to the next generation. Someone not willing or capable of making themselves sufficiently attractive to a woman to procreate has had it in evolutionary terms. Hence rage.