I have only flown Boeing's (all but 707, 777 and 787), so I have no knowlegde of the "laws" in the Airbus. I just donīt beleive that it is possible that two professionals with a respected airline can totally screw up. There must be something else.
If I were the captain, I would never had left the cockpit unless I trusted the other guys completely. So if the case was that the pilots were dumb, our industry wil not gain anything. Very sad. Flag carrier of France and a state of the art of an airplane.
This logging of who goes to rest and when, does nothing for safety. I rest better in my own seat than in the back where people run around and I would rather nap in the observer's seat than leaving the cockpit.
"Cruise pilots" was a bad idea from the beginning. There always has to be one captain every second of the flight. But it is cheaper with two co-pilots. So, unless otherwise convinced, the bean counters are to blame.