Peer Review.
Many thanks Genghis! You broach a traditional snag with composites. There is no lack of engineering re: applications, but there is a profound lack of agreement in the industry. Professionals hesitate to accomodate research in a highly competitive field. Signing on to another's paper can cost gobs of money down the road.
Add to this reluctance the need for critical standards in Aviation, and the myths prolong! I spent my early years watching the politics and the mercenary warfare involved in bringing organic chemistry into the mercantile.
"Propietary". Here is a word that to my mind hampers progress and safety.
The first automotive appearance for "plastic' was 1953. On the water, 1968. Aviation started folding in two phase materials in the early seventies. I continue to be enthralled with the concept; it remains expensive, energy intensive, and "sophisticated".
Safety? Structurally, the material is well received, and the squishy part has to do with survivability in fire, fume, and heat.
Aging is another area that presents some unknowns.