Pointing the dome at the camera is merely one way of using the tool. You do that if you want to average all of the light sources falling on the subject, on a plane that is parallel with the film plane. My argument is that there are many situations in which that is not the way to get ideal exposures and control; the way I see it, these are most situations (pretty much any situation with shadows). And getting into the habit of following one method for every situation takes away a lot of the control and benefit of using an incident meter in the first place. They are extremely versatile tools. Don't handicap that versatility by blindly following the universally-accepted directions without thinking about why you are doing so, and certainly not without learning exactly how they influence your results. As far as the technical argument for the "meter the light method," I have already explained that ad nauseam.