I had stopped using RSI,MACD,stochastics,CCI etc years ago because either they are lagging or they are subjective(not objective enough to give a clear picture at times) and moreover they all derived from price. So you can call them all as first copy. When you can derive all information from price itself (the original) then why depend on derivatives (Copies). OBV is different as it is a derivative of Volumes. It helps to gauge price movement objectively which is easy to comprehend.