It is very difficult for government to legislate for common sense. We should be thankful that government is allowing parents to land even if they are coming from Corona mis-managed countries. They could have easily said that parents will be allowed only once corona vaccine is out and parents are vaccinated. That would have been a very valid policy but government is humane enough not to insist on the same.
Vague policies have been the cause for the spread of covid 19.
As we speak the number of cases all across Canada continues to climb.
Common sense is no longer applicable in today's world where we see people making protests and vandalism in the name of their "common sense". I am loathe to rely on "common sense" these days. In fact I would say common sense is generally bad. Too many people are more concerned with their personal benefits and gains and can't be bothered about other people. The world has changed.
In any case it does look like there is a bit of disagreement from the "common sense" side of things as to whether taking a taxi is appropriate and safe for asymptomatic travelers arriving in Canada.
I would prefer that travelers not take taxis because a taxi driver is going to be taking several different people as passengers throughout the day and week. This means that the potential for spread is going to be there if the driver caught covid-19.
Private vehicles would be the best way. Again choosing who drives the private vehicle would be important as well. preferably someone who is not likely to be in contact with many people in the next 14 days.
So I am not going to be using taxis for my parents. The safest is still to have them drive themselves to the site for isolation.