I was commenting on what I consider a faulty analogy of using car assembly in discussing a reason to do software differently. You don't build (much of) any physical products using Sprints, because the goal at the end of a Sprint is to have some production quality result that a customer can review and approve to assure that development is meeting customer needs. When was the last time you saw buyers inxrementally approving the construction of their car. Perhaps if it was a custom build that might make sense, but even then, customer involvement would probably be to approve the design not the building of the car. (One exception might be in custom home construction, but, even then, the major approval step would be the design of the house.)