Apple iPhone gets A2DP Support Thanks to Add-On

So CrunchGear shows this image of this add-on for the iPhone that adds A2DP support to the iPhone. This means you can use stereo bluetooth headphones.

My question – Why doesn’t the iPhone support A2DP out of the box?! It’s supposed to be an advanced smartphone and they’ve left this part out? Weird. Nokia has had this feature in their N Series for quite a while.