I think young INJs and INPs have the most defensive outlook on what intelligence even is (or what's worth their time in general) making them the most stupid types. That is, until they stop being defensive, become a little more agnostic and open, and simply apply their judgment in troubleshooting things. Rather than using their judgement on the value of things.

Then they appreciate how much intelligence it takes to carry out some activities/projects they previously judged as stupid.. that this whole time, people weren't being stupid.. that they were merely interested in other things.