Another data point: I just had an Apple TV game rejected by Apple because of "black bars on the side".
Yeah, I think the Apple reviewers assigned to games fancy themselves game designers. Now I have the background fill the screen, but the reviewer still doesn't like having a 3D window over astatic background. The game was originally designed for a tall projection screen in arcades and changing the field of view of the 3D window that much for a widescreen TV isn't going to work without redesigning the game and content from scratch. Which actually they told me to do over the phone (after I appealed to their review board) when I submitted the same game to the Mac App Store because they said it was too much like the iOS version. But in that case I waited a few years and resubmitted and now they're OK with it.