[tonyhart7]

so it still "rocket science", you saying that the hard part is to make it lean and efficient

isn't that what they do in SpaceX????, your comment literally counterproductive

[4gotunameagain]

It is comparably hard to creating a lean and efficient car manufacturing company.

Yet you don't hear people throw the phrase "automotive science" around.

Rocket science has some niche parts that are very hard indeed. But this is not where the major challenge lies.