The Board has to promise, in law, to act to the best of its judgement and ability in the best interests of the island. Which means it has to put the island's interests first, not the Council's. Which means it has to be proactive not reactive. It has to play Waiheke's game not Auckland City's. It has to work very Hard at being the bat, not the ball.
Democracy is meant to be government of the people, by the people, for the people. So the public service is there to serve. It is there to execute the will of the people. It is not there to execute its own will.
Local decisions should be made locally.