I can't believe people are still trying to bang this incredibly misinformed drum. Yes. the millions of touchscreen tablets and smatphones on the market today have woefully inaccurate touch sensors which EVERYBODY complains about and don't deliver the absolute pixel precision required to play highly technical games such as slopping down giant blocks in NSMBU or tapping large menu items.
Oh and before we even get started on "Miiverse drawings!!", AutoDesk Sketchbook Pro and other highly efficient drawing apps are used by millions worldwide on iPads with their fingers to produce HD images of outstanding quality, or of course further still on Galaxy Notes with inbuilt Wacom technology.
The Nintendo DS was in 2004. Technology unsurprisingly moved on (the reason why Nintendo is failing to capture hearts and minds) and so should your ignorance.