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"shipyard building" or not -- you can't deny that SpaceX knows how to build stages with really good mass fraction. After all, that's how F9 S2 is competitive with these hydrolox upper stages even though it has a kerolox gas generator cycle engine.
Yeah that's another issue when talking about other LSPs "failing to respond to SpaceX" for building reusable rockets. ULA/European/Japanese might be able to reach such levels, but others have difficulties to even do that - e.g. the new Chinese rockets have poor mass fractions.
