With respect, anyone can read a book. A lawyer is versed in the law and process of the law and understands the relation between various aspects of the discipline, their integration and the foundation of the law by black letter. He is first weeded by introductory examination on his fitness to enter into the study, then tested on his understanding both in the classroom and, having successfully navigated that rigorous first and second weeding process is then subject to an additional and remarkably particular and difficult examination from the each state in which he desires to practice.
A lawyer who manages this is in a position to speak to the theory. Years later he can speak to the application.
Beyond that observation I've answered your understandable if mistaken assumptions on the points you raised. I don't fault you feeling the way you do and many a layman, informed to one degree or another or not, shares your impression. But it's just wrong.
Unless you give me additional specifics to respond to that's all I can tell you. I'm happy to address whatever else you'd like or to go into greater detail on anything I've already touched on if you want. Just let me know.
Attorney client privilege disallows me to go into specifics, as well as privacy laws and doctor patient privilege.