Icebraining's wiki link below hits it on the head, but my view is that knowing too much stuff deeply might make it hard to collaborate in teams as it makes roles really hard to define.

Happens in soccer a lot - teams with really versatile players will usually get whipped by teams who have specialists in each position. Top teams aim for squads with 2 players for every position, not 2 positions for every player.

Hope that makes sense, it's getting late here :)