Couple of rationales I've heard are licensing is expensive and the signal breaks up like Xm radio. One of the reasons I don't care about Xm radio is it cuts out due to terrain and underpasses. Terrestrial broadcast in more consistent.
But exactly why GM doesn't offer it? Heck I don't know.
My '12 Volt has NAV/XM/HD radio and I can pause/FF/RW the radio, just like a DVR. Other than a black roof, the rest of the vehicle pales in comparison with Gen2. Relish the other, nicer stuff you have.
I have HD radio on our other car and based on my experience with it, I don't miss it. We have a lot of multi-path in Los Angeles due to the mountains and hills, and it renders FM HD radio unreliable at best... AM is even worse.
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