On the laptop keyboards, where they began this icon/action association, they began at the left and moved to the right. I don't believe it matters entirely where. They couldn't jumble the media controls in with brightness, but now that there are 7 media keys they couldn't leave them on the right above the numeric either as there wasn't enough room. Now all controls are next to each other, playing controls, sound, and eject - perfect for DVD player.
But there still jumbled around for the small addition of relatively useless media keys. Why not leave them were they were, and make all the media keys the one that need the FN to work?
For what it's worth, the key is still in the upper right hand corner of the main keyboard, not off in the extended keyboard world. It also lends itself better to media controls than being off on its own at the end of a long line of F-keys.
It isn't in the upper right hand corner at all! Come on! It's thrown in the center of keyboard... and there is no such thing as extended keyboard... there is only a regular keyboard, and a short keyboard (the one used on laptops). We have to stop making excuses for bad design. This thing is still terrible and a fake.