Comment by ranger_danger

Pro-tip they're just not. A lot of tech nerds really like to think they're a genius with all the answers ("why don't they just do XX"), but some eventually learn that the world is not so black and white.

The Dunning-Kruger effect also applies to smart people. You don't stop when you are estimating your ability correctly. As you learn more, you gain more awareness of your ignorance and continue being conservative with your self estimates.