I have an iPod (non touch) that does not have BT..
I have an iPhone that has BT A2DP..
I have friends & family that have Non Apple A2DP phones..
and / or other Line-In devices..
Its not redundant.. its called Extensibility... and not being locked to one way...
There are times I want to just keep the iPhone on the dock and let it charge & play via Dock and not mess with BT because I am working.
At times I might not want to keep it on the dock, but play with the iPhone at leisure and have the audio go via A2DP Bluetooth..
Thats why! The flexibility of On desk and In-Hand..
PS: No offense buddy but that should have been obvious.. 😛