What a great effort by all crew members to evacuate the aircraft with no loss of life.
Not wanting to start speculation but I recall reading years ago when Airbus was developing the A320's Fly-by-Wire and associated electrical system, it was sent to the French military's nuclear research establishment for testing of the systems shielding for Electro-Magnetic Pulse (EMP) hardening and resistance to lightning strikes etc. The "official" Airbus description of the test results was that it was the "hardest" system that the military had ever tested.
Removing the Airbus hype, can any PPRuNer with the necessary technical knowledge advise whether the Airbus systems are so well shielded that a severe lightning strike would not not caused the Flight Crew to lose authority over the flight controls.