I've been lucky to be around some great people, though I think it's easy once you get experienced to write certain things off as impossible/unfeasible. It's not! And development isn't even that hard! Dev overconfidence comes in the form of arrogance, excessive skepticism, and "I'm-hard-done-by" nonsense. But like I said, I've been lucky to be around more examples of the opposite - the humble, and sometimes underconfident - than the overconfident and arrogant.
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