Because of Cowen's First Law: there's something wrong with everything.

So no matter if you've read the literature and implemented a process, there is something wrong with it.

That's why there threads persist. Every process has something wrong with it depending on who you are. Funnily enough everyone eventually manages to sort themselves into the right category.

The system isn't broken any more than armed conflict is broken as a way of settling disputes. It's works, it's just a little terrifying and awful.