Nothing is more practical than a practical theory.
Without an explicit theory about the nature of the beast and the reasons why it does what it does, one would be condemned to remain in the dark and keep repeating the past as though no lesson has ever been learned. All actions are preceded by some mental image, a theory, about the reality. Nobody, except perhaps an unborn child, is without a theory, no matter how crude and implicit. Those who claim that they are without one are either expecting others to accept their opinions unquestioningly or are simply unaware that they have it by default. Not to get bogged down in a theoretical maze does not mean to fall into the othe extreme of mindless action.