the smarties are invaluable in that 1% of situations where the difficult approach is the right one; you can't teach someone how to be smarter, but you can teach them how to be more clever.
staffing an organization is a balancing act between intelligence and practicality.
my smartest colleagues tend to be a bit... dumber, in practical terms. they prod just a bit too deep into the wrong questions, empowered to do so by their intellect; they get stuck trying to solve irrelevant difficult problems. the more normal ones, however, cleverly avoid this.