I've seen people complain that talking about Sweden's approach is pointless because other countries that took the same approach couldn't expect the same results, but that's actually much more clear for New Zealand. For a start, just the inherent leakage of infections into the country through the quarantine hotel system, imports, etc - which causes a new imported cluster say every hundred days or less at New Zealand scale - means that a larger country would never reach the point where they eliminate Covid. Then there's the problem that other countries are just too well connected compared to an island nation a thousand miles from anywhere - if you tried the same thing in EU countries or the UK, you'd run into the problem that they rely on a constant stream of commercial trucking traffic across the border carrying important things like food, people live in different countries from their workplace, etc, all of which help spread the virus.