Gliding speed
It is definitively false that this is the first occurence of total engine failure in an airliner ... Quite a few occured in the past ... This one is not the last one. Especially if the cause of the accident remains unsolved.
Considering the very special circumstances, and the basic limitations of a two pilots crew in such an extreme emergency, no one should blame the pilots. But ... that is not a valid reason to affirm that the aircraft was flown the best possible way to achieve a maximum glide and a safe touchdown.
The problem, as far as I remember, occured at 700 ft, that is one full minute before touchdown, not "a couple of seconds". The autopilot flew the aircraft down to the stall speed while - we may suppose - both pilots were busy trying to recover some engine thrust. This is the very classical trap indeed : both pilots busy with the hardware, nobody flying the aircraft.
Hard to believe that the auto-pilot had any kind of airmanship to deal with such an unusual situation. Bringing an aircraft to the stall, and letting it fall from 200 ft to the ground without any chance for a minimal flare is "zero airmanship". The auto-pilot was not programmed to achieve the best possible glidespeed, or to let go altitude for speed and recover the initial loss later during the flare ...
From a pure aerodynamic standpoint, we may assume with confidence that it was possible to bring the aircraft over the airport fence with a much lesser rate of descent. Same energy, but not the same trajectory.
Just basic piloting skills ...
Someday - perhaps - somebody will replay the event in a simulator, and experiment some other course of actions. Perhaps ... it is done already?
It should be, and whatever the results, they shoud be made public.