More people wouldn’t join their lives the way they do in a regular marriage. Everything would be about “mine” and “theirs”. I mean, honestly, in our marriage dividing up our lives sounds terrible.
I know that sounds dumb and simple but seriously some people really don’t think too much when it comes to getting married. Its a huge commitment and if you aren’t ready for it, don’t do it. Marriage is entirely optional, no matter what anyone says. It is. I love the way it is designed.
My biggest piece of advice is this:
If you plan on marrying someone, you have to marry them as they are. Do not expect them in any way to change and do not want to change them. You have to look at the person you are marrying and think “If they were exactly the same forever, would I be okay with that”. If the answer is anything but some form of yes, you are not ready to marry that person. You have to love that person as they are. Otherwise you are doing yourself and your partner a disservice.
But some marriages might actually benefit if it were a contract basis… Its up to the people involved on how they want to handle it.