I emailed the NZ Topo 50 team (poss a team of one), and yeah, resolution is due to file size.
I asked if it would be possible to download certain areas in higher res, and he said he'd look into it, but that was a year or so ago, and haven't looked back from NZTopoMaps. Well worth going pro. Ability to overlay aerial with Topo has been a bloody game changer!
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