[dexen]

Intelligence comes with its own particular blindspots. A person convinced of own intelligence is likely to follow a novel approach that is logical even if it goes against "widely established practices". I think we can easily name examples from our own industries; both positive and negative.

This is a double-edged sword in that it can both cut through the cruft of outdated ideas & bad practices, as well as cut off valuable experience gathered through generations.

Moreover a person with intelligence and deep experience in a particular subject runs increased risk of over-estimating own abilities in other, unrelated fields.