I think it's probably more appropriate to look at it this way:
The "headlights shelf" is the result of realizing that putting the headlights where the light bar happens to be would be ridiculously high and absolutely terrible for everyone else on the road. But the light bar couldn't move, there were too many concept drawings and renders that showcased the light bar. There was just too much "it has to look this way" pressure. So the headlights were crammed in a narrow space just above the bumper, meaning even a little snow buildup is enough to start blocking the headlights.
It's not enough to simply say "well the headlights are where they are and the bumper is where it is, so yeah there's a shelf but so what?" You should ask why these things are arranged as they are.
Look at the concept drawings and renders. The headlights are not there. The light bar was supposed to be the headlights. The location of the headlights is an "oh shit, what can we do about it?" reaction to a design that was fundamentally bad.