What makes this situation doubly ironic for me is that if Airbus had slapped a limit on autotrim in alternate law and that limit had prevented a recovery in another incident, the same people who are currently lambasting the autotrim design for unquestioningly following the PICs inputs would be lambasting Airbus for preventing a recovery by limiting autotrim authority.
The simple solution for avoid this double ironic situation is to put the trim in manual when out of normal law when trouble (false or no data at all)
This design decision was made based on the hypothesis that the pilot should have full authority across every flight control surface if the reliability of data was doubtful
Pilot full manual authority on ALL moving surfaces ...
My aircraft