The problem with divorces is when it comes to "equitable" (or even worse, "equal") distribution of marital assets. The laws are quick to make things marital assets (i.e. salaries, properties, investment accounts).
My premarital agreement is simple in that it spells-out that assets are to be kept separate. So I have a checking account as does she. I own property as does she -- but it's all separate. There is a procedure for transitioning property between us and we have certain holdings that are explicitly marital (i.e. the joint checking account we opened to pay day-to-day expenses). But in the absence of an explicit transaction that turns a piece of separately-owned property into a marital asset, it will remain separate under all circumstances (divorce, death, etc. etc.).
It's a fairly short agreement, but it has been upheld in Tennessee many times.
i.e. plunkey gets castle and 5-axis processor and wife gets squat lol