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O-D-C said:

interesting arguments, you might think that the '3D' games only use the top screen and the bottom screen is only for DS backwards compatibility and control layout


not necessarily, imagine Advance wars 3DS, the battlefield can still be depicted on the lower touchscreen, but the animated battles, can be shown on the 3D screen for example, anything that won't be dependent or greatly improved by the 3D effect can still be displayed on the touchscreen.