I've co-founded two startups and the biggest surprise/lesson for me was that most people don't want to forge their own path and customize every detail of their life. I had co-founders in each who after leaving our startups went on to 'normal' jobs and are much happier now.

There are without a doubt flight attendants who hate their job, but I'd guess that most of them like their jobs and like the structure and accountability that is provided to them, and not having to figure out every detail themself.

And then there are people like myself who can't stand being told what to work on and how to schedule my day.