I'm with jiminks on this, which is often a good place to be. One theory is that a broad bowl allows more different kinds of tobacco to burn at once on the surface of the ember thus producing a more complete experience of a blend of several or more tobaccos. Obviously, the blend has to be worth expanding to its full force, and that is often a matter of taste. I'd say if a blend has three or more kinds of tobacco, it is going to give fuller and more complex taste in a broader bowl such as is often present with a pot, author, diplomat, or prince. Or other broad cylindrical bowl. When a blend has five or six (or more) tobaccos, this effect seems especially apparent to me. I don't insist on this as a universal fact, just my experience.