So QF144 is getting an ATSB investigation for an engine failure because it featured in the news. But the other 8 or so group failures in a few months are nowhere to be found. Seems like it has to make the news in a sensational way to get looked at....
However if you lose two engines you’re still potentially looking at buying the farm if you’re over water. Bring back big quads!
Due to the gliding range on large jets the few double engine failures have resulted in reasonable results, from the Gimli Glider to the Hudson event and more appropriately Air Transat 236 which glided onto an island in the Azores. All with no loss of life. The main point is that if it's still controllable and you keep your cool, gliding a large jet into a safe place is achievable. After all the space shuttle glided every landing and that was a controlled brick.
TACA flight 110 in the 1980s landed on a grass levee after a double engine failure. The crew did so well Boeing only changed the engines and flew the 737 out off a nearby road (which in part used to be a ww2 strip).