It's easier to accuse GM of the opposite problem: Most of their software still has to be "properly" waterfalled and QAed because they don't update software on shipping vehicles. GM's software is often terrible because the software feature list was finished two or three years before the model comes to market. What bugs makes it past QA gets shipped and likely will never get fixed in the lifetime of that vehicle. As the software gets bigger and more important to vehicle operation, you can see how it may be increasingly tough for QA to keep up.
GM has been during PR on this car but the software is still far from complete.