[neuromancer2600]

I am very much concerned about focal accommodation. This becomes particularly important when driving at higher speeds. The sheer fact that my eyes do not need to adjust focus when looking into rear view mirrors (in comparison to cameras/screens) saves me critical milliseconds when overtaking a car or before making a turn.

Of course, this becomes irrelevant when we are talking about parking.

[mannykannot]

And, in addition, one can use one's stereoscopic vision with a mirror. Even if that does not provide much information about vehicle distance and speed (though it feels to me as though it does), a screen gives false stereoscopic information.