Nintendo Switch is based around a single screen experience Nintendo says

While there are many questions about the Nintendo Switch, Nintendo has answered at least one of them. The Nintendo Switch is a single-screen experience.
“Nintendo Switch is dedicated to deliver a single screen experience on whatever screen you might choose,” Nintendo told Polygon.
With the Nintendo Switch it looks like the company wants to go into a different direction. Dual screens have been Nintendo’s bread and butter since the Nintendo DS launched 12 years ago, and the Wii U doubled down on that by making it a core feature of the system. This could be one of the reasons why it will be harder to port Wii U or Nintendo DS games to the Switch
Nintendo is for sure going into a different direction that many fans may have to get used to, but this may appeal to the casuals.
https://www.youtube.com/watch?v=f5uik5fgIaI