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by p_l 1668 days ago
Control systems and manufacturing and simulation were already mentioned, but a more critical issue is that N1, due to various design issues, had no way to do static tests that other rockets went through, meaning many issues were found when the rockets underwent Rapid Unplanned Disassembly in flight or on pad.

SpaceX built a much smaller, simpler rocket - and had a way to do the testing before flying.