I understand why you and your DP see marriage as a patriarchal institution. Traditionally, it has favoured men. However, in the present time, it is a legal contract. The contract doesn’t mean very much when life is good and things go according to plan. In that sense, it isn’t really necessary. But the contract provides a lot of built in protections if the shit hits the fan.
Other legal documents, such as wills, trusts, estate planning, medical and legal power of attorney documents, can take the place of the marriage contract and provide the same protections. It just means you have fifty pages to sign instead of one.
Consider what would happen to you or your partner in any scenario below. Is it what you would want to happen? Would you prefer what would happen if you were married?
Inheritance - who gets the house? You or the kids? Can you support the kids on your salary alone if the house/insurance money goes to them and they cannot access it until they are 18/21/25/whatever?
Inheritance tax - think of future value as well as now. 40% of everything over the threshold. So you would only get a little more than half of everything that was his over the threshold. Maybe that isn’t much now. But what about ten years down the line?
Medical emergency - who gets to make decisions if you end up on life support in the hospital? Would there be a fight between you and his parents/his sister/whomever? Are you sure there wouldn’t be a fight at this very, very emotional time? Would it be easier to ensure there wasn’t a fight?
Break up - if you decide to split and it turns out that it isn’t amicable, would you get more support if you were married?
Pregnancy - you die in childbirth. How does he get the child home without going through the courts? I don’t think he can, even if you have a will naming him as father and guardian to your children.
Traveling overseas - do you want to visit Dubai? Or stop off there on the way somewhere else? If you aren’t married, you are not legally allowed to share a hotel room. (Rarely enforced, I know, but don’t piss off the locals because they can and will report it and it will be investigated and it will ruin your holiday, your bank account, and create a criminal record).
Immigration - are either of you considering living or working abroad in the future? Marriage makes this much easier than proving a de facto relationship. And not all countries would accept a defacto relationship.
Almost of all of these issues can be taken care of legally. The question is, do you have the time or money or inclination to take care of them? It makes wedding planning look easy! 😂