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On average. . . wrong. A hemisphere is a bit too abrupt, but not by much. A zeppelin or a classic airliner nose is about optimum. More length increases skin friction. The abrupt shape just processes the air faster, in a place where the pressure differential makes it easy to maintain control. At the back, we must be gentle. Getting the air to part is like pushing a pen through a sweater, but getting it back into a small wake is like pushing string into a hole without a needle.
I respect minds which question everything, but not if they hear nothing. I won't try to reply to all trolls on this topic, but might post original metaphors from time to time.
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