"Everything"
VicMel,
In the meaning of "what is really important" to understand what went wrong so dramatically to make a "complex System" fail in that way.
The ultimate goal is to learn how to avoid similar cases, addressing all issues involved.
The synergy between FDR and CVR info normally allow a very good UNDERSTANDING.
But i agree with you that we will be trying to understand the "reaction" of a complex System (in the sense an A/B is a "flying System").
We hope the 4X recorder with itīs (uncompressed) 37 MB could shown what we need.
Indeed a fascinating issue to many of us.
PS
IMO we will understand. Bu iīm not so confident that A/B will be able to learn everything to make their Systems perfect.
Reaganīs SDI (complex system) lack "Testability". Complex Systems are intrinsically unpredictable.
I prefer K.I.S.S. solutions with more "human touch" and involvement.
This trend makes me feel "too much alert" to situations i could not even understand when they arise.
A/B flying Systems has an history of "complex behavior" impossible to be solved IN TIME by the crew...