I was initially a bit concerned about the idea of this, until I read today an Australian who travelled from France to Townsville last week. He was tested for COVID-19 while in Australia.
He then thought it would be a good idea to fly to NZ while still waiting for his results. While having breakfast this morning, confirmation of a positive result came through and is now isolated to a hotel room.
If people are that thick, that they think they should travel while waiting for test results, then keep them out.
(mind you, he was Australian)
Dumb Aussie thought it was ok to travel while waiting for test results