Zkuq on 25 November 2016
Rendering for two screens would require extra processing power, or otherwise it would reduce the quality of graphics and possibly some other technical things. Maybe those are tradeoffs you would have made, but I doubt they would've been smart ones. I don't own a Wii U so I don't know for sure, but I have the impression that that controller's screen wasn't used well in very many games. I don't see why it would be different with Switch.
It would also increase porting costs, which is something I'm sure Nintendo wants to avoid. It should already be difficult enough if Switch is less powerful, so there's no need to make it even harder.
