The airlines may have policies on automation but no one tells you to fly on autopilot unmonitored. All these incidents happened because pilots were not scanning. Aircrafts like A320 hold the flight path then what else is left to do? The N1 from level flight at green dot to descent on glide path does not vary by more than 15% and with trend arrow guiding you at all times it is not a great skill. Proper training and sincere refreshers should be able sort this out. Too much manual flying in congested air traffic environment can create its own problems.