A lack of basic airmanship is just that. Unreliable airspeed indication is not a catastrophic failure. There is no "swiss cheese" here. This is a known event that occurred dozens of times on this specific type prior to AF 447. It should have been covered repeatedly. For a relatively "routine" emergency to cause a crash is a clear indication that the training and CRM culture at AF is an abject failure.
This is not an "AB" problem as much as an indication that things have tipped beyond the point of safety specific to basic airmanship. At the end of the day these pilots simply didn't know how to fly...a scary reality.