Let me be a little bold here. Sorry if I upset anyone.
If you watch the show (the dance of the manufacturers, retailers and more) then you learn that the system has gravitated to a system that looks a little like the following.
Content Source (BD, Cable, Game system) -> Receiver (audio processing) -> HDTV (video display).
Sure, most of us don't have the receiver and the pass through issues are mostly because of HDCP which is a long discussion on its own.
Hope this helps you see where this is going.