Each to his own I guess, but I cant drive without seeing my car in the mirror, as there is no reference point of what it is showing. Even small changes of the position of your head can alter the perspective quite largely, so a judgement of the whereabouts of a car that is seen in the sidemirrors is almost impossible. That can turn out to be a problem when you are reversing or going on a multi-laned road in heavy traffic, where you simply can't wait for your mirrors to clear up before you switch lanes.
Also, as you don't exactly know where your mirror is pointing, you could very well have the blind spot you tried to avoid.
Also, you don't have to adjust them like in your first link, where more of the half of the mirror shows your own car. There is just a really little part that needs to be shown, for example just the doorhandle of the back door.
To reduce the blind spot, we people in austria are taught the "3S" technique: Spiegel, Spiegel, Schulter = check inside mirror, then side mirror and then look briefly over your shoulder