Automakers learned that hybrids and electric cars need to look differently. Hybrid versions of popular cars such as the Camry and Civic don't sell that well. People who buy hybrid and electric vehicles want the rest of the world to know they drive one. The Prius, as dog ugly as it is, sells well.
Tesla cars are a bit weird too. They're not ugly, but you know it when you see one and that's what the drivers want.