Well. A Boeing with 8 turbojets and swept wings flew to 50k and higher.
The design is Sixty years old.
The technology is the problem, by process of elimination. Either the computer in the Airbus cannot fly without IAS, or it is incapable of retreating from the stage without insisting it be paid attention to first. Without BUSS, a pilot who has come to lean on a seemingly steady platform (with the encouragement and training and paychex of the operator) is sol. Wouldn't be the first time a lady seduced a gent to his doom.