Joe,
Forgive my ignorance but the 'anything you wish' part does not feel right.
If we take into account the intent of a commercial airliner, to carry passengers safely, then the limits must be low (ish)...there must be authority to maintain control in all situations.. within limits..
I do not recall (but my memory is fading) that the A300 series had a vertical stab issue prior to this during certifcation...nor that composite fatigue was cited...but then again I would need to read up on to be sure.
What is tragic is that the airframe failed in clear weather at low level and that it should not have done so, now if its structure then that's not good enough, if its pilot its also not good enough....either.
You are probalby right to keep on flying a metal plane.. perferably a real one.. like a G550......