Bart, your simple summation of the change - about the 'document limbo' - is genius. I'd not really set the model in my mind until I heard that.

I've not really sat down and studied the actions and workflows because I don't work with a heck of a lot of documents, but when I do I will be better equipped for having listened to your views.

I agree that, like other parts of the "normal" computing experience, document limbo is not natural. Nor was "scrolling the viewport" as distinct from "scrolling the document" which Apple now uses.