I'll add an answer this time instead of a comment.
I agree that 1. there should be consistency and 2. that it should be achieved by clear guidelines on regions and places.
3. I agree in principle to the change to the regions and districts proposed. I think it makes sense to people using WikiTree today, but we might have to think about the what-ifs when regions change, which seems unlikely, but they may do. That would obviously then create a task for the NZ project leader to have all those in one category moved to another (which you can do through a bulk change).
Most people starting off at WikiTree from NZ area are probably not going to be too concerned with the regional and district classifications, but if it looks logical (on the profiles they are adding or using) then they are more likely to understand or use the categories correctly. (thereby reducing errors)
The current NZ Template uses NZ, then region=, then place= - would you propose changing that to region= then district= rather than place? If not, what would be the list of place names that people should use and how will we navigate to them. Is there perhaps room for region=,district=, place=.... Should we now to go to another level of categorisation?
The historic names list - for places - should be on the free-space pages if they differ from the place names being used. The Maori place names should also be listed if we can do that, and link to an appropriate free-space page to facilitate pre-European classification.
What I would like to see is for Auckland to be broken up further in to places - at the moment you select Auckland, Auckland, but in many cases the place was something like Ponsonby, Remuera etc. You may think that is getting into too much detail? However Auckland, and some of our cities are becoming larger, and the more profiles in each region list, the longer and harder it is to navigate for research purposes. As you can appreciate once categories get into the hundreds of thousands then it may be time to think of sub-categorising.
Sorry, probably a bit off topic with the above, but it follows on from amending the categories, if that is what we propose to do.