It feels like telling mrs. fox niner to watch the road while driving a car
NO. Its more like telling mrs. fox niner to be aware of her speed while driving a car.
We know the how - a defective radio altimeter caused the throttles to retard at or around glideslope capture. The missing element is a human factors one -why did three professional pilots who would normally be well aware of their airspeed during an approach fail to notice the speed decay. What was the distraction?