One last item...
"I'm not sure how anyone can argue that something that cannot be seen by the naked eye is within the boundaries of line of sight."
I agree. I am not saying that it cannot be seen. i am saying that it doesn't necessarily have to be seen by the Pilot. You can use a spotter. If it is being operated in a boundary that could be seen by the naked eye, then it is within the boundary of Visual Line of Sight. Then someone could put on goggles and view from the airplane and fly within that boundary and be within the boundaries of Line of Sight.