You're talking about the manufacturing of cars, not design and prototyping. The reason that they can take only a representative sample of each component that ro

You're talking about the manufacturing of cars, not design and prototyping. The reason that they can take only a representative sample of each component that rolls off the assembly line is that they should be nearly perfect copies of the prototype which most likely did go through rigorous testing. In my analogy, building software is like building the prototype, not building the copies.