This was my understanding of why it's the way it is in NZ. NZ's hospital system was pretty full before covid, and from my understanding, wouldn't take much to get overwhelmed with covid cases.
On the flip side, there are so few unvaccinated now, that I don't know how big of an effect the measures have with regards to unvaccinated restrictions.
Having said that, personally I've not had any issues with the current restrictions, they don't impact what I would usually do. But I'm probably the exception, not the rule when it comes to unvaxed people.
I'm of mostly of the opinion, the restrictions are of a net positive for us, if you're not vaxxed I would avoid gatherings, especially indoors. Seems kinda reckless if you're going to parties etc while unvaxxed.
*not vaccinated, mostly because I don't socialise much so don't see the need, not until I want to fly. I see it as, the longer I can wait, the more we'll know about the vaccine, and hopefully there will be better (more effective) options.