Old Carthusian,
Your mantra is KNOW YOUR MACHINE but in the meantime don’t want to hear about technical stuff … ?
The simple fact is that it was the crew who put the aircraft into the situation where it crashed - nothing else.
Equation is simple : If a type is repeatedly exposed to unreliable airspeed indication at cruise flight level, the manufacturer has to be aggressively proactive by publishing at least a safety bulletin addressed to all operators with a clear procedure to be followed if needed and to recommend all operators to train their crews for such eventuality.
When you have practiced once you are so much better equipped.