At the end of the book you know Micawber, whereas you only know what has happened to David, and are not interested enough in him to wonder what his politics or religion might be if anything so stupendous as a religious or political idea, or a general idea of any sort, were to occur to him. He is tolerable as a child; but he never becomes a man, and might be left out of his own biography altogether but for his usefulness as a stage confidant.