Earlier in my career I saw exactly this situation come up with a manager of mine, had the perfect overlap of a few skills that don't frequently come up together

Earlier in my career I saw exactly this situation come up with a manager of mine, had the perfect overlap of a few skills that don't frequently come up together but this was completely taken for granted. As a result there was an amazingly bad plan for expansion/handover/etc as it was taken for granted that it would be easy to hire a replacement. > This experience has made me wonder if cognitive dissonance plays a larger role in blinding HR/companies. I think cognitive dissonance was also at play in the case I'm referring to. There's probably a lot of biases at play when people are trying to estimate what skills someone has. Also its easier to delude yourself into thinking the Bayesian priors are different when you have someone who has the rare combination of skills on staff, I remember hearing a few versions of: "how rare could it be when we already have this manager on staff?".