It looks like the Wii U menu has too many prompts. After you press the home button it asks you twice, if you want to close the darn software. People aren't idiots, they know they are pressing a home button.
You don't see the "Close this software and return to the Wii U menu" prompts in every Wii U game.
And don't understimate people's "idiocy" "I want to change the controllers settings.... Oh shit!!! I hit the close software button"
Don't know why it bothers you so much tho. I takes like half a second to choose the "Wii U Menu" option.