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Aug 1, 2020 at 0:59 comment added Ed999 The other answers all tend to the same implied conclusion: if you spend a billion dollars on launch vehicles, when you might have spent less, that money is wasted. That is a naive argument. That billion dollars is spent in the US, providing jobs for US technicians. The arguments for spending less are, in effect, saying: let's provide fewer jobs in the vehicle manufacturing and/or servicing sectors. Every tax dollar spent is supporting American jobs. That is, in itself, a sufficient justification for this type of project - even if most of the jobs are in Alabama!
Jul 22, 2020 at 15:33 comment added John Bode This is the correct answer. SLS is a creature of politics, not engineering. It's meant to keep as much of the old Shuttle workforce employed as possible. Which, in and of itself, is not a bad reason - there's a lot of institutional knowledge and skill that's worth preserving. The main problem with SLS/Orion has been shoddy project management on both NASA's and Boeing/LockMart's parts. It was always going to be expensive, but poor management and cost tracking has made it worse.
Jul 21, 2020 at 0:40 history answered SafeFastExpressive CC BY-SA 4.0