Really, it is good to learn from other more experienced traders when you are starting out and try out their "systems" but when it comes down to it, you need to tweak it or develop a system that works for you and not trade someone elses. And you can never stop tweaking it, you have to be always adapting to the market changes. It is hard to adapt whenever you are being spoon fed by someone else.
What are the returns and profitability characteristics of such a holy grail system? There is only one holy grail in Western myth. This would imply the ultimal limit of performace which can't be exceeded, a bit like the speed of light in physics. Or are we really talking about a number of "excellent grails" as opposed to "The Holy Grail"?