Earlier quoted context omitted.
Hearing (one of many) alarms is one thing. Feeling the control wheel or stick fighting you is far more direct. AF 447 was absolutely a UX failure.
If you're going to go against the conclusions of the accident report, which is very thorough, you'll have to do more than just assert that the side sticks were responsible. Check it out here: https://www.bea.aero/docspa/2009/f-cp090601.en/pdf/f-cp09060...
Second (and as noted in the parallel subthread), the BEA report does not include cockpit transcripts in section 2, 2.1, and relevant subsections, in describing the cockpit situation. It mentions specific utterances of the crew, but not in the specific context and sequence they occurred. Other reports do include these transcripts and from them it's highly probable that multiple inputs were being supplied, or that even if that was not the case it could not be ruled out readily.
There are multiple references in the BEA report of the level of confusion and complexity of the situation. The merits of scheduling the Captain's relief in the ITCZ crossing, the flight path itself relative to other aircraft which had diverted around the region, the loss of instrument readings, autopilot disconnects, multiple audio alerts, the disabling of a master alarm that wasn't clearly deliberate, the stated confusion of both co-pilots, the switching to and from "alternate law" of aircraft controls, and more.
Adding ambiguity of flight controls, feedback, and possible multiple inputs in the context of all of this again strikes me as, well, a disaster that actually happened.
In a description based on the full transcript:
02:11:21 (Robert) On a pourtant les moteurs! Qu'est-ce qui se passe bordel? Je ne comprends pas ce que se passe.
We still have the engines! What the hell is happening? I don't understand what's happening.
Unlike the control yokes of a Boeing jetliner, the side sticks on an Airbus are "asynchronous"—that is, they move independently. "If the person in the right seat is pulling back on the joystick, the person in the left seat doesn't feel it," says Dr. David Esser, a professor of aeronautical science at Embry-Riddle Aeronautical University. "Their stick doesn't move just because the other one does, unlike the old-fashioned mechanical systems like you find in small planes, where if you turn one, the [other] one turns the same way." Robert has no idea that, despite their conversation about descending, Bonin has continued to pull back on the side stick.
http://www.popularmechanics.com/flight/a3115/what-really-hap...