Sounds more like a religion to me. Sorry that was flip. I was being flip with Kirk too. Basically, if there's no precision in a language, how can ideas be properly communicated?
According to Zone System testing, Zone I is four stops down from Zone V and Zone VIII is three stops up from Zone V. Sounds to me like the the Zones in the 7 stop range between Zone I and Zone VIII are divided into one stop steps.
And who ever said sensitometry isn't creative? The Zone System is basically simple sensitometry (which includes Tone Reproduction Theory). Perhaps it's more accurate to say the Zone System uses Tone Reproduction Theory.