Thr angular Cybertruck design was actually not primarily for show. It comes from the fact that its body is made from cold-rolled, full-hard stainless steel that can't be stamped into arbitrary shapes. Ordinary car bodies are made from steel that can be stamped but is not stainless, so they require paint.
The original design was that the body would be made from these panels. The exoskeleton structure.
The Cybertruck that was released did not have that, instead the panels are just normal body parts connected to a standard car frame underneath - like any other car.