We can only make assumptions here with the data we've got so far.
GA made quite early in 2nd approach.Other aircraft(Russian locals-they dont divert readily) have been diverting so we can assume wshr and turbulence on approach was a genuine problem.Now if they got a windshear warning,either predictive or reactive,they have to follow their recovery procedure which is to disengage AP AT and fly out of it with no config change.The report of GA was matter of fact so perhaps it was not w/shr but mod to severe turbulence with speed excursions(flap overspeed etx).When they pull up,the PF follows the extreme ANU FD command,they get the unusual attitude and possible speed decay and try to recorrect but overcompensate esp with that very powerful THS.
FD fixation is a known problem with new generation pilots who are trained to fly/use/trust/depend almost exclusively on automation.
Its a funny thing actually.Because automation is a great tool.It is of great help to a pilot.But know when to use it,when not to,when to see through a FD command and ignore it and when not to.That is NOT being trained.
Problem lies in the training department(political correctness-emphasis on procedure-use AFDS dont fly the plane etc),not with these pilots.If you fix one you can fix the other.
A conference to collate/disseminate data on this known problem(pilots cant fly anymore) would be advantageous to aviation safety.Those airlines who remain a beacon of hope for this industry should call it and changes should be mandated for the good of all.Not easy to accomplish.Southwest,Qantas and Lufthansa could lead the way.All 3 emphasize stick and rudder and airmanship.Have flown with one.2 of them never crashed.Training excellent.Other airlines have much to offer.Belgians traditionally value manual flt skills and "fly the plane" .Americans too.BA has much to input.
Conference could address other abnormals like fatigue,rostering(esp am to pm consec changes),SICK/UNFIT never ever questioned,qualities desired in CP and Flt OPs post holders,pilots back at board level(absolute must).When I saw the gentleman on the right at FlyDub conference,I instinctively knew this airline had major problems and they were all coming from top down.
Start at the top,and the problems down through the ranks will start to disappear.You have to get the right people at the top first.