@tz Wow, that's very unfortunate about the MetService. Thanks so much for trying to do something.
I believe the problem is unlike most countries NZ's meteorological organisation is a "State-Owned Enterprise" so they are mandated to be profitable. That's a terrible idea for something so important -- in my opinion. And that's why the BoM in Australia (where I am right now) or Environment Canada are much more generous compared to the MetService in the data the public has access to.
At this point I think the best bet would be for any NZ citizens out there on Windy to write to their local MP to complain and alert them to the poor service the MetService provides. It may also be useful to report to the local media, stuff.co.nz has good local reporting, how New Zealanders are limited by this terrible arrangement for their domestic meteorological organisation.