I've never worked in such an environment myself but I imagine it feels something like soldiers feel following a leader who feels like he knows what he's doing. It's the feeling of shared hardship and shared experience and it creates culture of driving to follow the leader.

I imagine Elon Musk (at least used to, not sure if he still does) cause the same experience in employees. That's the sense you get when you read books like "Liftoff" that document the early days of SpaceX.