This and the parent thread sound kind of simplistic. In any non-trivial-size company, there are many managers, and the space on top is always limited. So lower and mid-levels have to compete with each other for that limited space, they can always be undercut, left behind over an outside hire, end up on a crappy project by bad luck, end up with a bad boss or the opposite, a team of incompetent ICs who fail to deliver while there is only so much a manager can do. Always have to beg for adequate resources and overall be at the mercy of a large number of random people. Saying that it's disneyland designed for easy promotions doesn't... really sound correct?