There are reasons why hemispherical designs are not dominating, and those reasons probably aren't trivial.
Sure, there's a lot of advantages such as maximizing the volume to surface area, minimizing force in storms, convection of heat benefits, etc.
It's easier to build things in straight lines. The Cybertruck emphasizes the fact that straight sheets of durable material are easier to manufacture than compound surfaces.
Property is usually divided in rectangular plots, and not circular. Building to a straight line is easier than a radius. Sectioning a rectangular space into rooms is an easier task. Having a consistent height ceiling is more accomodating...
My thought is spheres are more appropriate to submerged living areas where the structural integrity is important.
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