I heard David Letterman say within the past decade that on the days he did not feel the show was very good, he couldn't bring himself to even leave the building until it was dark outside, out of shame.
Meanwhile, at home, I would practically be shaking with excitement waiting for the show to start, I so appreciated it.
This tale somewhat suggests that people who perceive themselves as incompetent and inauthentic might spend more of their time striving at work, which could raise the bar, maintain a high standard and eventually breed something resembling confidence.
Or it could just continuously undermine their natural confidence and sense of self-worth and debase them such that they are easy to overwork and manipulate. It can also just feed into fears that invalidate the satisfaction of any jobs well done, leading to burn out and feelings of futility.
People who are overly confident can behave brashly and do damage, while automatically imposing costs on others, in the form of the time it takes to crack through their false beliefs or the duplication of effort it takes to walk back their mistakes.
So, this is kind of a nothing post, basically a lament. It's not clear whether suffers of Impostor Syndrome or Dunning-Kruger type symptoms have an easier path to a more moderate position, but each one seems likely to be rampant in just about any workplace.