Musk is talking about eventually having 1000 Starships ferrying people and materials to Mars every synod (every 26 months, when Earth and Mars are in...
They've also likely got a bunch of steel that was good enough for early prototypes or tanks, but not for for the prototypes they're building now. And...
Simplicity is valued when it results in reduced cost and improved reliability. The RS-68 is expensive, and look at recent experience trying to launch...
Ablatively cooled for cost reduction but still manages to cost $20+M/engine, pays the price of hydrogen fuel for performance which it then squanders...
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