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@gbj_tester
The leading edge is blunt as a compromise between induced drag caused by pushing the air aside and skin drag from the air friction over the surface. Faster bodies use a more pointy leading edge, with more surface area for a given cross section giving higher skin drag but lower induced drag. The sharp edge is the trailing edge, to bring the two air flows together with minimum turbulence. Fining the trailing edge involves a similar compromise between skin drag and induced drag. As a further complication, bicycle components are restricted by UCI regulations to a maximum aspect ratio of 3.0:1. Typically, the thickest section occurs about 1/3 distance from front to back, making the tail about twice as fine as the nose.
Stupidity, failing to read the instruction or the arrows printed on the wheel :-) It's not unheard of among professionals, notably Ulrich riding a TT with a Xentis 4-spoke in the wrong way around