The one thing to consider is it is possible, maybe even probable that GM doesn’t really know when they will receive the needed parts to make your vehicle complete. So, what, then, would/should GM tell it’s customers. Because it seems like “we don’t know” is not going to be an acceptable answer…and there is the issue….it sucks, I agree…but clearly they either are missing parts or they have a part they discovered was defective…and are awaiting replacements. My guess is it isn’t just one part, but across all the vehicles, a multitude…and probably way too complex for the normal order info system…