@SecondJon this has not been my experience. In my experience business requirements include rebuilding the wheel, because we built it before, but for a different customer, and we aren't allowed to use the same wheel for this customer, and we need someone different to do it because if the same guy does the new wheel we'll be sued by the last customer for it being too similar.
@SecondJon I didn't even think about a consultancy situation. Most of my career has been as a direct employee of a Teir I automotive supplier.