To each his own
The insistence that accidents must have some commonality? At some stage, the paradigm is crested, separation of systems is impossible. What is needed is a safer recognition of and reversion to manual control. A perfect system is impossible; on landing, relying on A/P to maintain altitude (or slope) is a tricky proposition. This is a very fine endeavour, at a time in the flight when safety margins evaporate, as they are intended to. Similarity?
How about Colgan's trim wheel? 447's flight into upset? Auto pilot and dependence thereon? 038? Who needs to keep the glideslope without power? At some point in every flight, there must be a firm and well annunciated transition to mode of flight. What's it doing now? 400agl? Marvelous time to ask the question.