All this technical discussion is of little value. We will never know. The DFDR records the output of the sensors. Sensors that had failed. I suggest that even if they find the blackbox, it will only add to the mystery.
What we do know is that the aircraft flew into a huge TS and didnt come out in one piece.
How many pilots that fly across the Atlantic would divert 100nm from track to go around a TS like this? -bearing in mind that that same TS will probably make the HF unusable. I have gone 80nm off track to avoid. Scarey with no radio contact, although it was a random track, not a NAT track 60nm from the next one, although TCAS is a nice backup.
If you had carried min fuel and diverting 100nm around weather would mean that you couldnt make your planned destination would you still go around it? Probably less than said yes to the first Q. But we will all be more careful from now on. And carry more fuel if the sig wx chart looks scarey.