Pitch + Power is king when you're faced with an unreliable airspeed indicator, imho
Likewise, I incline to raw data and pitch/thrust.
However, it only goes so far .. one must be doing it throughout the flight so that one knows what's what in the bigger scheme of things.
Falls in a heap if the aeroplane is stalled and the pilot fails to recognise this .. cf AF447. Sure, one can recover on instruments without too much angst if one is practised and maintains I/F proficiency but, if the skill is not there, all bets are off.
I have no experience in the cockpit with a specific AA indication but hold the view that it gives one the extra data useful either for precise flying on approach or in extremis.