On the contrary, I'm pointing out that "simpler" is meaningless in this context. The two companies face fundamentally different challenges and require completely separate skill sets. Some people will be better suited for Twitter, whereas some people will be better suited for SpaceX. For the same reason that you shouldn't commission a mathematician to remodel your bathroom, you shouldn't expect the CEO of SpaceX to successfully manage a social media company.
For further reading, I'd recommend this article in the Atlantic. The relevant portion is about midway through.
Compare how many companies can reliably launch rockets vs how many can reliably create social networks that aren’t dead in a year. I think it’s clear what’s more difficult
