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The real question is if others maybe thought it's not worthwhile because the R&D cost isn't justified. Like "a solution without a problem".

I think its money, regulations and viable business plan, because govt is the only market and its risky.

From the engineering perspective what's the real challenge here? Because senors are so capable and control software are mature already.

I know for sure that EU public development of similar technology is gated between approvals and bureaucracy, in addition to environmental limitations that SpaceX can ignore.