LOL... Reminds me of a little kid in the back of the car saying 'are we there yet' ....'why aren't we there yet'...
He doesn't know how they will do it. Well until he does, wouldn't it be better to just listen to the experts and stop complaining? Doesn't he realise that the virus is raging outside the border? There is no way to prove someone is COVID free from overseas, without quarantining.
Potentially our borders are already open for many people to come back, it just requires people to quarantine, which is just people sacrificing a bit of time, which they could use to upskill.
You could look everywhere globally, but just one easy sample, Victoria, Australia. Doesn't need to be New Zealand. There is no easy out, no matter how easy words are.