Yes, the article is interesting but not convincing. The shape is a compromise for volumetric efficiency, stackability, ease of manufacture, and field-toughness

Yes, the article is interesting but not convincing. The shape is a compromise for volumetric efficiency, stackability, ease of manufacture, and field-toughness. Spheres are highly impractical on all dimensions. Caulk and pepesi (pardon my pun) don't come in spheres, squares, or rectangles either...probably for similar reasons.