dxzh wrote
2. Why is there now no presumption of a latent serious design flaw in G-YMMM and the 400 or so similar B772ER aircraft, given the tentative findings that G-YMMM was apparently operated within a normal flight envelope by competent crew with the correct spec fuel?
You're assuming that because G-YMMM was affected it must have been particularly prone to such a failure(whatever it was).
From a statistical point of view this is not a valid assumption and the incident might actually be equally likely on other aircraft types.
We're talking tiny probabilities here and a single incident is not statistically significant.
So ithout some idea of the cause it would be difficult to justify taking action against a single aircraft type.