From a driver responsibility point of view, it is a fancy cruise control, there is no question about autonomous certification because the car isn't autonomous.
If one day, Tesla thinks it is OK for drivers not to pay attention and wants to make it legal, that's when the question about what kind of tech is reasonable will be asked. But for now, it looks like we are far from it. There is a huge gap between "works well most of the time" and full autonomy.