Would you replace your marriage with such a contract?
What do you lose doing it?
You might be able to 'bind' one another with such a contract but hospitals, governments and blood relatives? They won't care.
Your alternative fails because it doesn't work in the real world. That's why their argument exists.
Here in Pennsylvania, you can download a template form off the internet, spend $5 or so to get it witnessed and notarized and it becomes just as legally binding as a marriage certificate. Other states have similar procedures.
It is only an issue because the gay mafia wants to redefine marriage.
BS! Power of attorney, living wills, etc... provide for all but government recognition of the marriage for tax purposes. The government’s recognition of marriage was only ever there to promote marriages where procreation could occur - to promote the type of familial structure that has been shown time and again to be the best possible situation for well adjusted adults; realizing all the while these would be adults who eventually become productive taxpaying citizens.
Would you replace your definition of marriage for something that obviously doesn’t promote a healthy lifestyle?