All EVs look the same for the same reason all super cars that can top 230 mph look the same....aerodynamics.
When you are dealing at the extreme edge of tecnhnology you can’t compromise function for style.
The 2011 Chevy Volt and 2011 Honda plug-in have the same basic shape of a Toyota Prius.If they divert from it they will have a smaller range of electric driving.
The GM EV1 had a top speed of 230 mph?
No, it was lucky to get up to around 80 km/hr, about 55 mph. That roaring speed did not need much in the way of aero-dynamics, certainly not more than IC car designs.
If you run a search for General Motors’ EV1, the car design I was referring to, you will see its much criticized “funky” look. That funky look certainly was not designed for a car that could go 230 mph.
Perhaps you are unfamiliar with this discontinued electric vehicle, which was pronounced a failure. I would have bought one if I could have driven 230 mph in it. My Volkswagen 4 banger oil/air cooled could out run the EV1.