A "maintenance professional" is one helluva long way separated in so many ways from an engineer, or a materials scientist that I'm surprised anyone would give any weight to their opinion.
A lot of laypersons (including personnel employed to bolt and unbolt things on things that take to the air) seem that they just can't hurdle the concept of a non-metallic aircraft/parts. I even read someone equating keel breakages on super-maxi yachts to Airbus design flaws....
Not even close!
