From the Norwegian B737 near stall event this telling morsel:
It's a pretty concerning incident. The sound of the trim wheel continuously running has been drummed into my head from Day 1 in the sim as a major cue that "something is not right"
Too bad the A brand hasn't seen the value of this concept.
In the case of AF447, it is pretty evident that the crew was so stressed that they had turned their ears off.
Maybe the C chord tone is too overpowering when combined with other problems? Haven't flown it, so I have no idea.