I don't accept that an AOA would have been a safety enhancement. These guys already had task saturation and were unable to perceive the real problem despite the FWC's blaring "STALL STALL" at them all the way to the ground.
During AF 447 that warning stopped at least for a time, so in some respects their confusion despite remaining in the stall was understandable, however Air Asia had no such ambiguity, The FO held full back stick for the last three minutes of the flight and from this point on the captain, for whatever reason was unable to provide any useful assistance, notwithstanding some words that were best described as gibberish.
For the Indonesian authorities to point out that this was at least a flight training problem within the organisation is completely appropriate. If one of them were having a bad day but the other guy knew what to do that might be bad luck but neither of these guys were competent to be in a control seat and that has to speak to a significant organisational failure.