They are designed to be printed on a machine that does not use support material. If you are printing a part with a hole (axis parallel to the build plane), it is difficult to print the "top" of the hole without the material sagging. A teardrop shape has the benefit of keeping the material overhang within reasonable limits.
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Yup. That's exactly why! In fact, if you look at their logo, it's the same teardrop shape - an homage to this omnipresent design consideration.
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