Thats why I am sticking with my standard head unit in the truck, well, that and onstar compatibility.
But at least the onstar problem has a (not inexpensive or elegant) workaround with an extra amp/speaker combo.

I actually got to use onstar last week after I locked my keys in the car and got them to remote unlock it. It worked even 7 floors down in a multistorey parking lot. The doors unlocked just as they called me on my cellphone to confirm it worked, very nice.

Interestingly, the speed based adjust works when you are talking to onstar as well. I mention this because the separate amp workaround can't do that either.