The image you linked is actually an example of incorrect mirror setup (and even has the word "incorrect" in the file name).
Here is the link to the parent article which you conveniently (or hastily) skipped: https://www.team-bhp.com/forum/road-safety/168258-eliminatin...
Here is the excerpt describing the image which you have linked:
"Anyway, people have a variety of opinions regarding how to best adjust their mirrors, and almost all of them are wrong. Why are they wrong? They’re wrong because they intentionally create blind spots for the sake of making sure drivers can see things that are entirely irrelevant. Most road users have their ORVMs adjusted like below"
Here is the link to the correct mirror placement:
https://www.team-bhp.com/forum/attachments/road-safety/14154...
I linked to TWO PICTURES, the first is the CORRECT way with mirrors facing the ROAD, the second is the WRONG WAY mirrors NOT FACING THE ROAD.
If you have eyes, working eyes, look at both pictures. Which picture has the mirrors facing the road, and which picture has the mirrors facing the car? (Hint: Your wrong way is shown in the incorrect picture, where the mirror is facing the car)
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You can't even see I posted TWO links and you have the audacity to call my point invalid and claim I'm conveniently skipping things, maybe pick up some reading glasses to go with your newfound reading skills before you reply.
It's physically impossible for your side mirrors to show exactly what your rear view mirror does (since there's a whole car in the way...), so no matter how your side mirrors are adjusted, your rear view mirror is serving a function and shouldn't be obscured.
And the mirrors work the opposite of how you think:
If you point your side mirrors and your rear mirror at the road behind you, they will show you different views, not the same: https://www.team-bhp.com/forum/attachments/road-safety/14154...
If you point your side mirror so they show you the side of your car, they will show you an overlapping view of what your rear view mirror does on top of significantly reducing what you see on either side of your car: https://www.team-bhp.com/forum/attachments/road-safety/14154...
In the EU the driver's side mirror is allowed to be convex which is all the more reason to not waste a large portion of the view on looking at the side of your car. There should be just barely any of your car visible in your driver side mirror