"..How much better would a human pilot do with three separate sensors connected to three separate airspeed indicators? If indeed there is a pitot icing problem here, the problem is a mechanical/physical pitot/static sensor design problem NOT one in the software/automation."
I can visualize a PF saying, "Hey, my airspeed is falling off." The PNF replies, "Mine, too; and so is the standby, just like that recent advisory."
PF then disconnects the automatics and flies attitude.
Meanwhile, the automatics behave exactly as they were programmed 15 years ago. They didn't read the advisory..
GB