This comes from an interview with the German outlet Spiegel Online. Our good friend Gerjet helped with the translation on the following answers!
Spiegel Online: The controls of "Star Fox Zero" are due to the two screens a challenge.
Miyamoto: Compared to other games, it is a bit complex. There are many ways how video games entertain the player. One of it is the process understanding how a game works - another the process to master the controls. With mastering the controls you improve, which results in having fun. Out intention was not that players suggest: "There are two screens, that is making it complicated" Instead: "There are two screens, I can do different things on them."
Spiegel Online: How long does it take to get into the game?
Miyamoto: It is hard to understand the basics, if you just try Star Fox Zero for a few minutes at like a games expo. Anyhow, if people buy the game and play it at home, after one or two days, they will reach the point where they understand how it works, how to master it - that is the moment the fun begins.