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Heat engine efficiency is governed by 2nd law of thermo (Carnot theorem). To achieve high efficiency, radiators in an ICE & cooling towers in a power plant need to have large surface areas as they dissipate heat through convection. Other option is to burn fuel at very high temp.
You can get a very large surface area in a tiny volume. Same essential idea as space-filling curves (though different). Requires fans or something similar to rapidly remove heat.
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Higher surface area = more cooling naturally. Using fans would reduce overall efficiency. Just like using a saucer to cool down hot tea is more efficient than using a fan/refrigerator. Space filling curves are great (like ant colonies) but hard to manufacture at scale.
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Most things worth doing are hard; that's not an argument against.
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