Again, without theory, there is nothing to revise. Without theory, experience has no meaning. Without theory, one has no questions to ask. Hence without theory, there is no learning. Theory is a window into the world.
Theory leads to prediction.
Without prediction, experience and examples teach nothing. To copy an example of success, without understanding it with the aid of theory, may lead to disaster. Any rational plan, however simple, is prediction concerning conditions, behavior, performance of people, procedures, or materials.