Hi Rob.
The BUSS system is available. Also available is an Artificial Horizon, independent, and gyro driven.
Air France chose not to fit these to this A330. To some folks, these additional, though optional systems, may also have been a help.
I think in retrospect, those who lost loved ones would have accepted a small hike in the ticket to have had this kit aboard.
Yet we see even this proposal dismissed, and in the name of what?
PRIDE.
#1 If it can happen, it will
#2 If it can be foreseen, and mitigated, it should be.
#3 The rest is autopleasure.