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BrangdonJ t1_j9yphih wrote

I see the switch to methane as part of a sea change in the launch industry. Part of the realisation that hydrogen sucks as a first stage fuel, which is significant because NASA in particular were fixated on it for decades (and still are for SLS). Part of the New Space willingness to rethink old assumptions and ways of doing things. The switch is a symptom rather than a cause, but still a sign of the times.