No. You are wrong. It is due to the world’s greatest project management practiced by the world’s greatest project management specialists and is designed to make sure that nothing is done that deviats from what was stated as the requirements. The problem is that it is horribly expensive and deals poorly with things that go wrong or things that turn out differently than you thought. We have long forgotten how new things are actually developed you know, like Goddard and the rocket or the Wright Brothers, or Kelly Johnson and the SR71 or Elong Musk and the Falcon rocket, or almost anthing else that had to be invented.
It’s managerialism - bureaucracy and control and tracking over getting real work done, testing and experimenting and fixing and prototyping until you have something that works and you can sell.
Hmmmm.... well, obviously the Gov needs to go Agile then! That’ll be the cure for their rigid requirements problem.