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Comment on NASA's SLS rocket's Mobile Launcher-2 increase from $383M to $2.7Bparent

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Well, they do a lot of fundamental try/test that others use then, including SpaceX. Didn't want to defend NASAs schedules, of course, but still they are often the first pioneers in many areas. And that plays not really well with public money, unlike private startups that can do whatever.

NASA still does great stuff but SLS specifically is not exactly a pioneering program. It's a disposable rocket using Space Shuttle engines, attempting to go to the Moon again.

Meanwhile SpaceX got reusable first stages into production, and recently got the world's largest-ever rocket to orbit and attempted to land the second stage. And it's all powered by newly designed engines that significantly advance the state of the art.

There are _a ton_ of innovations in SLS, especially in the space ship (payload). Engines is just a small piece of the program, not really important one. Over the years a lot of theory improved, a lot of new technologies developed (e.g. materials, IT) and SLS tests them for space. Kinda "deploy in production".

Could you be more specific? Because as a launch rocket, it's so absurdly expensive that it will never be useful other than for low-volume national vanity projects. What technologies has it developed that might be usable on other platforms?

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