[p_l]

For all that I personally like to dunk on Musk, SpaceX follows majorly classic incremental engineering pipeline, and there are people who check things thrice. Some of it because as "new" product in aerospace they can't just skirt things like Boeing did with airliners. Some of it being customer due diligence.

And even Musk personally acknowledged that he nearly tanked SpaceX early on - because they didn't have experienced engineering lead to take the project - and he ended up hiring one when they scraped enough on government money to get there.