The popular version of the Dunning-Kruger effect says that stupid people overestimate their capabilities. This is true, but the effect is more general than that.

It says if your expertise level is different from the average, then you judge the "average competency" differently. So if you have above-average expertise. Folks who had above-average education tended to overestimate what average education looks like (and vice versa).

I notice it when I use LLM. Things that I know well, I can spit LLM slopiness. On other things, LLM output reads like 'expert'.