Alby_da_Wolf on 16 April 2014
It would be uncomfortable, because it would force you to use it in a limited range of positions and distances. Also, on 3DS the 3D screen is close to the 2nd display, you haven't to adjust your eyes' focus when moving your look from one to the other, having 3D on the gamepad would make the process of adjusting your focus to and from it a lot more tiring for your eyes.
