Earlier quoted context omitted.
I've read about this supposed "solution" and the greatest thing I took away was that it trades side-of-car blind spots (which I can resolve by turning my head) for rear-of-car blind spots, which I can do nothing about, as my head doesn't rotate 180º.
You can't see behind your car using your wing mirrors, you need to use the rear-view mirror. Even if you have the wing mirrors pointing behind your car, the sides of the car obscure your view. I like to adjust the wing mirrors so that a tiny sliver of the car is visible in the mirror, that way I can be sure I'm not missing anything.
What you do is "normal". The suggestion from the comment I replied to is referring to the "new" way referenced on the linked page, where the mirrors are set wider.