Never flown anything in my life ... but I do wonder whether it would be a sensible idea for there to be a spoken warning whenever the AP reduces the engines to idle? The root cause of the crash seems to be the pilots not noticing that the AP had done this, whereas if there was a simple spoken message "Engines idle" as the AP shut them down, then the situation may have been very different. Interested to hear from pilots as to whether this would be a workable solution? I appreciate you don't want to overload the pilots with verbal warnings, but engine shutdown seems pretty fundamental...