The contract could be perfectly formed, and still unenforceable.
At the end of the day, it's a piece of paper. Enforcing it in a civil court will take years, if not decades and costs tens of thousands if not hundreds of thousands of dollars in legal fees. Most people don't have the time or the money to do this, so it ends up "settling", often times with arbitrary fairness.
Settlement is more a game of "who can do what to whom".
At the end of the day, it's a piece of paper. Enforcing it in a civil court will take years, if not decades and costs tens of thousands if not hundreds of thousands of dollars in legal fees. Most people don't have the time or the money to do this, so it ends up "settling", often times with arbitrary fairness.
Settlement is more a game of "who can do what to whom".