Systems work when the "problem space" (for lack of a better term) is narrow. Callanetics is a good example, as is a card counting system for the game of Blackjack. A system can also be used to get "on track" for a short period of time. I do not believe that any system can deal with all the richness and complexity of a free life. Sure, a complete system can be used to run a prison or a monastery, including self made ones, but that is not how I want to live.

For a free life one needs a set of guiding principles and the flexibility to act. Systems can help in well defined areas, but they are not useful for running one's life.