Airways Corp of NZ were strongly advised NOT to adopt the single centre NZ approach for this very reason
Airways primary focus is making money. Having more than one centre, while helping to to ensure a good service, would cost money.
CEO Craig Sinclair
Ahhh the one and same person who had grandiose ideas about Airways NZ taking over and running the UK airways system. He even set himself up in a flash office in London. All for nothing and at what cost to Airways NZ.
... most senior controllers would refuse to move and probably take redundancy.
Miss the likes of Eddie (I think his name was) with his disctinctive drawl, but very calm and efficient way he did things.
This has been a disaster ever since with low staff numbers and controllers struggling to obtain ratings in the demanding Auckland Terminal sector
This helps explain some of the below par service that is delivered on occasions.