Enough for now....
Unfortunately I don't know what you consider to be enough, which was kind of the point of my question. I also don't know what YNZ think is enough, nor ACC... which I think underscores why it's difficult to really have a productive debate about this.
As for the rest of your post, whether or not anyone agrees with your specific suggestions, at least they represent someone actually attempting to think through the objectives, constraints and options, which I think is fantastic. Unfortunately none of the consultation processes that I've seen have sought this kind of input,