There are many reasons why you would want a person who had the power to not just collect but actually demand that statistics be provided. It's compulsory to fill out a lot of surveys done by Statistics New Zealand. It's critical that that person with that sort of power has their power tightly circumscribed and held accountable and that the official statistics that they collect are subject to a high standard of privacy and cannot be misused, and the person collecting them cannot be interfered with politically if the results of their statistics might turn out to be politically charged. Those are things that at least the previous Statistics Act preserved.