Minimal benefit - pretty close to zero, actually. Just a thought
(Bezels are functional, and not just for holding it - there's a reason why visual art is displayed with a frame or on a monochrome wall - it separates the content from the ground. Given that the iPad is used in all kinds of situations against all kinds of backdrops then it is useful to have the visual demarcation of a bezel. The ability to turn it off offers little.)