Anyone who's not "secure for life" and has to keep the salaries coming in will have to deal with bad people, bad decisions, bad culture, etc. and become unhappy.
I've sort of dabbled in that situation: I made and lost a fortune on the stock market at the start of this millenium. Not filthy rich, but enough to never have to work again and live a comfortable, middle-class life.
I didn't "get out" because of greed, and voila, the bubble burst and the comfortable situation was over - I was at the mercy of my salary again, and everything that comes with it. Dumb colleagues, inept superiors, boring work, etc.
My employment situation didn't change - but when I had the theoretical opportunity to just quit with no financial worries, I was happy despite everything. Once that stopped, I became unhappy, or rather, baseline neutral again.
When I was in the comfortable situation, I was carefree and open to pursue ideas and projects brought to me which I knew were stupid and prone to fail. My colleagues loved it, of course.
I learned that worrying about whether I'll have enough money to live somewhat comfortably until death is what makes me unhappy, and extremely wary to avoid failure. There's nothing else to it.