And cost? Carbon fiber is really not used much for anything outside of very high-performance cars except as trim. Other materials that are better in every respect to carbon fiber, like graphene and carbon nanotubes, are also very expensive. Where the structural strength of CF is not required, even high-end automakers are using plain old aluminum instead. There's little to no weight penalty and it's so much easier to work with, on top of being much cheaper.Lightweight, ability to recycle the material, stronger than steel, resists scratching, and can be painted in the same facility as the sheet-metal body. It is also much more stable when molding/forming.
Literally better in every category than the previous material.