The Dunning-Kruger effect isn't as the article first quotes. It's an effect that everyone experiences. We as humans tend to over simplify things we don't understand well or at all. Therefore we over estimate our expertise on these subjects. We also tend to under estimate how much an expert on subjects we do know well. Everyone does this. It's not just dumb people.
> We also tend to under estimate how much an expert on subjects we do know well
Any evidence for this, except Dunning-Kruger? To me it looks like everyone overestimates themselves. There are a lot of professionals who think they are undervalued and that people worse than them gets all the rewards and fame.