Fully agree with that point of view.
Can not see the inconvenience of stopping at some place where there is Customs, or Immigration, to supervise the "turn-around", with a pre-arranged payment of a certain quantity of fuel, and the landing fees if that happens to be the case. He stops, someone puts the fuel in the aircraft, and he goes. No need to come out of the aircraft.
In spite of the current new quarantine regs. it appears only a few small percent of arrivals are being quarantined (we are told as little as two or three percent,) and there are reports of non essential journey arrivals just walking out of YVR without inquiry as to their status.
Have no idea of the applicable rules, but could that be the case for Canadian citizens, and in the case of foreign people the applicable rules are different ?