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Yes, if the bottom of the car is smooth and streamlined, then a pointy nose will either not help, or it might even hurt a bit if it redirects air the "wrong" way. So, to make a well designed pointy nose, you would have to determine where the natural stagnant point is -- and put the pointy nose there.
If the bottom is smooth and the ground clearance is properly designed, then a blunt front end lets the air "decide" which way to flow i.e. it is not forced to go where it doesn't "want" to go -- which means it will be lower drag.
BTW, one of the main things that was tweaked on the Schlörwagen was the ride height: if it was too low, then the drag increased, and if the ride height was too high, this also increased the drag. The right height was between 6 and 8 inches, if my memory serves...
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