It's also literally how the Christian Bible is written. Man just was, and Woman came from a rib.

It's reflected in our language. It's not that mankind was named after men, but male humans were named after mankind, while women just kept the old "wifmann" name old English. Which is where "wife" also comes from.

We literally had "wif" and "wer" that just straight up meant female human and male human but we ruined that.