Please keep in mind that setting your mirrors this way is no substitute for looking over your shoulder before changing lanes.
What a lot of people refer to as “blind spots” are not the areas you can’t see with your mirrors. Blind spots are sometimes created by structural components, like the B pillars and C pillars, when you look over your shoulder. Even if you set your mirrors this way, blind spots are not a myth. They are still there. Even with your mirrors set this way, there are still areas around your car you can’t see.
Dagosa, I cringe whenever someone doesn’t turn their head to back up, especially in a car. Even truck drivers look over their shoulders when they can. That is why they almost always back up at an angle where they can look over their left shoulders. Straight line backing is easier, but you see less of your path, and blind side backing is next to impossible without getting out of the truck several times to check your path.