Along with everyone elseโs points, keep in mind that topology plays a part. That raindrop is a single solid object whereas a car can have air got through the grill, engine bay, cabin, etc. The most aerodynamic solution becomes infinitely more complex based off that alone.
On top of that, thereโs value in the air resistance. If you want performance, you need to generate downforce to stay on the road and maintain grip. If you donโt counter air resistance enough, at higher speeds, youโre losing grip, potentially lowering power output, potentially even generating some degree of lift which could lead to lack of control. In essence, the physics might say itโs a good idea, but the engineering and economics say itโs a bad idea.
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