Have you been reading english very long ? When , pray tell , did he tell you that ? His point is perfectly valid , a great director will know 100 % how acting will best be done , though he can ' t do it himself . A aeroplane engineer will likely know the theory perfectly behind how to fly a plane , yet will not be able to pilot one himself . A professional connoisseur will know exactly what is missing or what could be improved in a dishwine , yet won ' t be able to cook it or make it himself . jesus , even in league and sports , the best coaches and analysts know the game almost perfectly , yet there ' s a great reason they ' re coaches and analysts , and not pro players themselves . edit I would much rather a professional engineer design a plane I fly in , than a pilot I ' d much rather see a movie directed by a professional , not an actor eat a chef ' s food , not a connoisseur ' s see a real coach in charge of a team instead of some pro player .