Before you throw something out, or completely write something off, make sure you have exhausted all its possibilities. The tendency to throw away things that seem silly or redundant is understandable, but there also may be a reason why these things have lasted so long. Caricaturing the “other” side of things is easy; we want to boil things down to one or two tenets- its easier to write off that way!
In the process of purifying your thinking and processes, you may accidentally lose something fundamental. The wisdom of those who came before you is at your fingertips. If they felt compelled enough to make an effort to write it down, perhaps its worth considering.