My take is that there are probably multiple systems out there than can help you achieve mastery, but it depends on your personality, life circumstances, etc. Just like there ten thousand paths up the mountain. It is a good idea to try out a couple and find the one that works for you. Then if you get to the point where you master your target skill and it is your turn to spread the gospel of "the way", it is good to keep in mind why it worked for you.