I think the point is exactly what you brought up in your car example: A mechanic is not an engineer is not a physicist. A developer is not an engineer is not

I think the point is exactly what you brought up in your car example: A mechanic is not an engineer is not a physicist. A developer is not an engineer is not a computer scientist. The problem is that CS is a young field, who lacks both trade schools (ie, places to train working developers) AND struggles with the engineer/scientist divide within universities.