Let's take EBA and Ouendan.
They told stories on the top screen and you did gameplay in the bottom screen.

What about Daigasso! Band Bros:

The World Ends With You LITERALLY uses both screens for combat AT THE SAME TIME.

Etrian Odyssey, the game where you draw and chart the map for survival.

A lot of games used it for bonus information without cluttering up the game screen, allowing for smooth UI's.


This was helpful for things like visual novels, which used it to make interesting storytelling techniques in their direction.

In an RPG, this is useful because you get to see more of the battles without clutter.


I love not having to go to a menu to look at a map. And I like having the entire battle field viewable with UI specifically its own place for battle.
In a game like Monster Honter, although for the 3ds, the dual screens actually allow for more optimal control due to the lack of analog stick.

Saying the dual screen set up wasn't used to its advantage literally shows your ignorance and that you have no idea what you're talking about. It's hard to take your opinion seriously beyond any objective merit.