Bertrand - what if you don't have joint or seperate assets though?
Lots of women don't.
What if you fell in love, moved in to the house he owns or you were renting together and that's fine because you had your own job and bank account and you had lots of lovely holidays and hobbies and nights out and if you split up, you could easily rent somewhere on your salary.
Then you get pregnant either unplanned or planned. You're committed to each other and know you'll always do the 'right thing' by each other. You don't need to get married because having a baby is much more of a commitment than getting married.
And you don't entirely agree with marriage anyway and/or don't see it as necessary.
And you have a baby and give up work or reduce your work. Or 2/3/4/5 babies. And you're too busy or it's too costly to get married or you still simply don't feel the need to because there is no bigger commitment than having a baby with someone.
And he meets someone else or you want to end the relationship because he's abusive or you met someone else or you both agree you don't want to be together anymore.
And you came into that relationship with no assets. You paid towards the mortgage/bills at first but for years you were a SAHM who took money out of the family account or you maybe paid some nominal bills like phone/car insurance from a part time job.
And now - he wants you out or he's willing to leave but there's no way you can pay the mortgage on your own and he's under no obligation to do anything but pay a nominal amount to your children (if he does that).
Which is very likely if you were in an abusive relationship or if he's just fucked off that you met someone else or didn't want to be with him anymore and as far as he's concerned, he's paid for you to stay at home for years while he's done all the 'hard graft' so now you need to sort something out and get a job. Don't expect him to reduce or adapt his hours so you can work though.
The misogynistic and patriarchal undertones of the marriage union are so very, very minor these days when compared to the misogynistic and patriarchal results of a society where women become lesser earners, bear more caring responsibilities and are more likely to live in poverty as a result of society making them rely with no legal protection whatsoever (without marriage or having their own assets which they formally protect) on men to provide for them and their children.
Because it often doesn't happen.