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Having worked for or with these companies as an engineer, the most concise explanation I have is culture.

Boeings culture is not technically focused, nor mission focused. Boeings culture is Boeing focused with a particular emphasis on shareholders. The overwhelming majority of managers I’ve worked with at Boeing view engineers as a plug and play commodity and are woefully ignorant of the general subject matter they manage. Many I know at Boeing have an exceptionally difficult time taking responsibility for mistakes that Boeing makes. Whether it’s commercial planes or crew capsules, it’s somebody else’s fault and Boeing knew best. Hubris is rampant across Boeing. What’s fascinating there is that there isn’t a damn thing worth being proud of in recent years, but the cognitive dissonance remains strong.

SpaceX culture is mission focused. Their managers tend to understand what it is they are managing. Their workforce is rather young, however, they test things and are willing to publicly fail in a way that Boeing and others will not stomach. When SpaceX does fail, they tend to take full responsibility, learn from the issue and solve the problem.

SpaceX is more or less doing what NACA and subsequently NASA did in their infancy. It’s nothing new, but it’s a major difference as compared to what NASA and its ecosystem have evolved to since those early years.