Id argue that 4% is why it needs to be used.
Im not telling you to speak it fluently, but if you asked the general population if they use Maori at least once on a daily basis it would be much higher that 4%.
Or just simply remember its like sign language - if its all people want to or can “speak” and an official language they should be disadvantaged.
Devils advocate.
How many peaces, truces, agreements in that area have ever meant something?