Compare two projects - real live ones in the same organization - of similar size, complexity and cost. Why was one an utter failure and the other a resounding success?
Your project is only as good as the people you put on it - and this includes the governance team. A key role of executive management is to ensure you have the right resources on every project.
Most projects miss, lose or destroy more value than they deliver. But most of the waste incurred is invisible, and so it is neither measured nor managed.