Beating the dead horse
c'mon, folks.
We know with a large probability/certainty that the jet was flown at a high attitude as the airspeed slowed and that all the "protections" did not keep the jet from exceeding the stall AoA or even the basic limits we see in the manuals.
Basic design problem and pilot problem, IMHO.
Without being a fellow ghost to talk with the PF, we'll never know. And I ain't willing to meet the dude in that great hootch bar in the sky just yet and ask him, "just what the hell what were you thinking?".
Many of the graphs we have seen here should be examined by the accident board, but the focus should be on the basic control laws that the jet employs.
I also have problems with training and exposure to the worst conditions. this thing started with a fairly benign sensor failure, then escalated to a tragedy. Some crew failures, some design deficiencies. It all added up.
Hope to hell that the board recommends some changes to the control laws and reversion sequences.