No decision making involved if it's CAVOK all the time...for just "getting through" the VFR training
It all depends on the time of year you complete your actual flight training. I'm sure that NZ during their summer season is CAVOK most of the time much like PHX is, along with the occasional rain shower system in the area.
PHX has also had it's rough share of weather recently too with all of those violent dust and thunderstorms in the month of August.
I understand that it is important for pilots to train in both good and bad weather, especially during the VFR stages, but I'm also sure that it wouldn't be very pleasing when most of your flight lessons get cancelled during a week with rough weather. There is a reason why, depending on the time of year, the Basic and Intermediate flight training stages take a few weeks (If not months) longer in NZ than they do in PHX.