OK right, I agree with that. If you're a manager hoping to run your UX through one person you're going to have a bad time. That said, a lot of true innovation in user interfaces is going to come from a solo person dreaming something up and doing a bang-up job of implementing it. I think even a large company would benefit from encouraging side experimentation from their designers (or even non-designers) as part of their "20% time". (This is one more reason to decouple the logic from the GUI.)