And in "traditional" marriages, women absolutely do work. They just do unpaid labor (and often more than the man did, working weekends and evenings as well.) Laundry, cooking, cleaning, childcare, are all work.
And having kids can be emotionally fulfilling. Watching the development of ones children and experiencing the world through their eyes is powerful.
And I agree with you, if a woman doesn't want marriage, great! She should face no stigma for that choice. But your attitude that marriage is somehow transactional or whatever ignores a lot of human emotional aspects.