Is there any live threatening reason as to why the air valve on a tank always faces forward (The back of the diver's head). I recently bought an EDGE Epic cold water regulator and I would need to use a Din to Yoke adapter in order to use it locally. In my very personal, yet inexperienced opinion, I believe that having the air valve facing back while having an adapter will be a little bit more comfortable and would only require a longer hose in order to not put any strain on the second stage. Can someone explain this to me?