I suppose you can still have a prenup explicitly sharing wealth 50/50 if one party will take care of the kids and home while the other will earn money.
The problem with all of this is always intangible wealth, and unpaid contributions to the household. Person A got a degree while person B sweated away to keep a roof over their heads. If they divorce the day Person A graduates, with zero net assets, Person B gets the raw end of that deal (Unless it's a degree in Latin poetry.)
Or, person A made money, while person B did all the unpaid housemaking, childcare, etc. Or, person A made the money, did the housemaking, childcare, while person B bummed around, drunk all day.
All of these are special cases, and none of them can be covered by a one-size-fits-all policy. It's why divorce litigation is necessary, as a safety valve, and why pre-nups aren't ironclad.
Or, person A made money, while person B did all the unpaid housemaking, childcare, etc. Or, person A made the money, did the housemaking, childcare, while person B bummed around, drunk all day.
All of these are special cases, and none of them can be covered by a one-size-fits-all policy. It's why divorce litigation is necessary, as a safety valve, and why pre-nups aren't ironclad.