Company hires 5 different managers for 1 employee, only 1 of the managers actually contributes any value: 'Why do companies keep employing these people?'

Why keep hiring employees that you don't need? 

If you've ever been a part of a large company that is growing, you've probably had the experience of getting new, useless coworkers just because your company can afford to pay for them. They aren't particularly good at their jobs, but they are good enough at interviews and personality hires to fenagle their way into a well-paying managerial position, at least for a little while. If your company is small, or experiencing a lot of layoffs due to economic difficulties, you probably don't have many useless employees around. Your company probably has the bare minimum of people to keep the place going, and no more. When the economy is bad, there is no place for pure personality hires. You have to be a personality hire and a hard worker all in one!

Some people resent their coworkers because they can't see the value that they bring to the company, so they assume they don't bring any. The guy in this story is incredibly resentful towards the many managers that his company has hired, and on one hand, I don't blame him. It's kind of ridiculous to have five different managers who all struggle with tasks the employees they manage can easily do. On the other hand, I do wonder if he's being a little too hard on them and judging them because they are women. I'm curious to know what you guys think about the guy in this post. Is he overly bitter, or does he have good reasons to be bitter?