Suffice it to say that there is plenty of blame to go around and the crew cannot be exempt.
Yes,no argument on that, but I am not sure it can be described as error in that they were not equipped to deal with the scenario they found themselves in. The reasons for that need to be laid bare and never allowed to happen again, and there is a clear requirement for significant extra training and awareness, but that's post event hindsight, at the time, the relevant people saw nothing wrong with the way they were operating, and that may well be a false sense of security because the automation is usually so reliable.
If I had to put words to it, pilot inadequacy is closer to the mark than pilot error. They were never trained how to really
fly the aircraft, they were trained to
fly the automation, which is fine while all the systems work as designed, but if they don't, this is the inevitable result. The reasons for that are much wider than just the pilots, they go right to the top, and fixing it will have to go to the top as well.