I agree with the gist of the article, but it I noticed it didn't mention the research that some classes of experts actually make worse predictions than a class of generalists... I think referred to as wolves and foxes, but I can't remember.
If you like that, you might also like the book Expert Political Judgement by Philip Tetlock which uses the Hedgehog and Fox metaphor to analyze people's political judgements. https://duckduckgo.com/?q=expert+political+judgement
http://longnow.org/seminars/02007/jan/26/why-foxes-are-bette...