Expertise is a double edged sword. On one side, it’s knowledge, it's useful, and it’s leverage. On the other side, you can become insulated and you can lose touch with context. "The danger of the expert is that he often becomes a prisoner of his own expertise." -Peter Drucker. There is no field of knowledge that is static or complete. Nothing is in a state of true equilibrium, so if you don’t move with the unfolding of knowledge in your field of expertise, you become increasingly obsolete and irrelevant.