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A pre-nup could handle the best interest of the children far better than a court.

Best interest of the children are to minimize parental conflict. No matter the outcome, a legal process inflames conflict.

Arab countries have this right. There is a strong presumption that kids go with mother up to some age, and father beyond. The rules are clear and simple, barring exceptional circumstances. Some of the Scandinavian countries do to. Barring exceptional circumstances, there is a presumption of 50/50 custody and child support is capped.

There is nothing to fight over, and fighting dies down. The US high stakes system, where child support is astronomical and where everything is up for fighting over, is the biggest loser here.