Why do I want a screen on my controller?

[NJ5]

puffy said:
Going by this thread Nintendo really need to dumb things down so that people can understand the basics.. No wonder they aren't showing more info right now when people don't even understand the controller..

Also hands-on sessions have said it is really light so I don't think the size will be a major issue.

Please tell me what basics I didn't understand...

@kowenicki: Price won't be an issue because apparently you can't even buy the Wii U controller. There's one per console and that's it (which defeats many of the possibilities which were actually promising with this controller such as local multiplayer with or without hidden information).