You may have interpreted it that way, but that was never what I was saying. The PDU has been continually evolving for 25 years now, that's one of the things that has made it what it is today. The story has also been evolving for 25 years now... It's amazing what an average writer can actually wind up after 25 years of evolving and adding to the same story. There are characters who have evolved through nearly a dozen different storylines than no longer exist, but the character retains all the depth they aquired through all those old and now replaced storylines. The PDU is all about evolution, that is what has made it what it is now.
It sounds like you are referring to something I had been trying to say about actually writing complete game design documents instead of 20-40 pages of vague notes. My games essentially begin at what you call "Alpha", rather than 20-40 pages of vague ideas.