I believe you are right

I would have thought that by now, without locating the remains of the aircraft and/or the black boxes, all that can be done already has been.
Is anyone still searching for AF447, or has that also been called off?

On this one I believe you have hit the nail on the head. It’s so quiet that it is likely that all searching has been abandoned.

Possibly legal compensation won the day with bereaved families which still sadly leaves a lot technically unanswered.