The point has been that you don't need a parser to figure out the ideal way to play your class. You only need one to confirm that you're doing so. Even still, I don't think a parser would help you figure out the ideal way to play the class. Without at least a basic idea of the math behind your class, you'll always be shy of playing it "properly" as the current meta dictates. You either get that math basis by calculating yourself (which I'm showing is "easy" to do) or by looking up a guide whose author has already done that legwork for you.