I don't know what it is about us technically minded people that makes us so confident in our knowledge in so many fields like that (note that I'm including myse

I don't know what it is about us technically minded people that makes us so confident in our knowledge in so many fields like that (note that I'm including myself in that generalization). It seems to go beyond your garden variety Dunning–Kruger effect. My personal supposition is that most people don't know very much if anything about most subjects, and tech people tend to know a bit more than that quite low average (though still not anywhere near expert level) in an above average number of subjects, and that "novice polymath" status amplifies the Dunning-Kruger effect. Of course it's entirely possible that demonstrating the Dunning-Kruger effect by even thinking we tend to have an above average exposure to an above average number of fields.