The way I see it, if they weren't going to utilize the Gamepad screen for anything then they might as well do nothing with it and save battery life. It's not that big of a deal imo. It's better than having some useless display that serves no real purpose.
Totally agree, but it is weird to me that this is the default and only option if you're playing on TV. The gamepad screen is still running, it's still backlit, it's just displaying a blank, black image. Surprised they don't have the screen actually off. That should be an option along with the NSMBU-style use of displaying the same as the TV. Or just having the collectible tally (KONG letters, puzzle pieces) in a grid.