Iirc Pre-Nups tend to get thrown out because what most people think of as "protecting their assets" turns out to be the equivalent of an agreement made in bad faith.
Courts don't screw people over in the way many think. People will try to screw people over, sure, but a prenup doesn't protect against that.
Courts in most states don't give either party a choice or input with regards to alimony or child support (especially as a portion of what is collected goes to the state), so a prenup doesn't protect that either.
When a court splits up assets it does so to keep one party from being destitute because they chose to be a stay at home parent or never had their name put on any assets. It also prevents either party from escaping joint debt just because they didn't sign fir it either.
Far more important than making a prenup that won't likely stand up in court in 5 years, the depth of the legal implications of marriage should be discussed. Too many people think too lightly of marriage's legal aspects.