[4gotunameagain]

The problem lies in forming and managing such a huge organisation that deals with the problem in an efficient and lean way, not the technical aspects.

The materials science aspect is a challenge, not to produce, but to produce with a sane cost.

The rocket science aspect of things (namely the linearisation of the booster model in order to be able to be solved in constant time by an MPC) is more or less a solved problem.

Coordinating such complex interconnected systems will always remain one.

[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.