“Physicists studying sport have established that many fieldsmen are very good at catching balls, but bad at answering the question: “Where in the park will the ball land?” Good players don’t forecast the future, but adapt to it. That is the origin of the saying “keep your eye on the ball”.
As complex systems go, the interaction between the ball in flight and the moving fieldsman is still relatively simple. In principle, most of the knowledge needed to compute trajectories and devise an optimal strategy is available: we just don’t have the instruments or the time for analysis and computation. More often, the relevant information is not even potentially knowable. The skill of the sports player is not the result of superior knowledge of the future, but of an ability to employ and execute good strategies for making decisions in a complex and changing world. The same qualities are characteristic of the successful executive. Managers who know the future are more often dangerous fools than great visionaries.”

I think you could say the same about education and medicine: you can say less than you know.

John Kay