Because maybe you can't. We don't know (at least, I don't) what aerodynamic constraints Tesla is trying to work with. I doubt Franz suddenly decided he'd like a frumpy car because fashion!
That's all true, but I think you missed the point. Someone asked why there's a focus on looks and then it was pointed out that despite many thinking it looks odd, the Prius sells well.
So clearly there is SOME importance to looks, and one might assume that you'd sell more cars if your model was aesthetically pleasing to the masses -- thus answering why there's a focus on looks.