[Zope] Why no full Zope?

Skip Montanaro wrote:

Thanks, interesting, but in my case, probably not immediately useful. It slipped my mind when posting that I need to qualify all my zope posts with, "I'm not using full-blown Zope. I only use ZServer + DocumentTemplates." Still, knowing that there is some mechanism for Zope doing this, gives me hope that I can perhaps do it just by twiddling bits in my code.

Why not just use all of Zope and be done with it? cheers, Chris