So you are not talking from experience, just your subjective observation.
If a woman freely chooses to stay because SAHM mother, that is a great thing. But historically, traditional gender roles always lacked, and still do, the egalitarian aspect. So in a traditional set up the woman is responsible for running the house, looking after the children, cooking, cleaning taking care of the husband and all his needs, carrying the mental load of everything and for every etc . Whilst the man, who in this set up is the „”provider” ( controller of the purse strings), the „”head of the house”, means that he comes back from his 9-5pm job to a cooked meal, and then has time to relax or have „”me”, whereas the woman is basically on call all 24/7. Mumsnet has so many threads by women, in exactly, these traditional set ups, who say they feel not valued, invisible, they feel like doormats, who have no financial control within their own homes, over their own lives etc. Yes, I am sure there are many traditional marriages with traditional gender roles, which are happy, but that definitely is in the minority. Sorry, women deserve a lot better than such inequality in a relationship, and I am talking from experience. Very clearly you are not.