The Pursuit of More but Better

In the book you say it's the disciplined pursuit of less but better. How do you view that mentality of trying to fit even more in when we know exactly what we should be working on? I mean if non-essentialism is producing breakthrough contribution, really meaningful relationships, satisfying life, happiness in the moment and a sense of mission for the future, keep doing it. The problem is that most people don't deliver on its promise. It can present a short-term burst of activity, but it quickly becomes a diminishing return.