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Dragon receives long-planned propulsive landing upgrade after years of development - NASASpaceFlight.com
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Understood, but I'm asking why it wasn't an approved last ditch backup plan until now. Did they do more testing or sumulation recently? Is NASA more risk averse after Starliner and digging deeper into backup backups?
From the article it sounded like it just needed more SpaceX development time to polish it up and come up with software that NASA was happy with.