every domain of expertise has two "elo" systems, the niche one and the broader one.

e.g. you can learn basic juggling in 30 minutes that you are top 10% of your friends/colleagues etc...

however within the juggling community itself this is known as the "3 ball cascade" a really simple trick relative to the ones that requires years to master. an outsider may not be able to tell the difference between the 1 year expert and the 10 year master.

a lot dunning-kruger can be explained by people in one or the other not understanding the other system