1. Soulless design-by-committee. 2. Complex internal politics - "Cool idea you have there with the Prius, but I don't want to see it become too successful and eat into the sales of the Corolla. We need to sell 200k Corollas or I don't get my bonus". 3. The "proven" technique of having focus groups with a diverse crowd of aged-35+ white suburban soccer moms tell you what features they value in a car the most.