No, I'm not. If you're talking carbon strands vs. a metal in it's manufactured state then yes, metal is "harder". But carbon is never used as a "stand alone" in bike frames, it's obviously laid into epoxy resin, the end product, depending on that resin can certainly durometer out harder than a whole bunch of metals.

And you're dead wrong about brazed joints being stronger than glued, certainly for shear strength depending on joint clearances and design. Some industrial epoxies can produce double the shear value of your average brazed joints. I'm probably one of the few people commenting on this that has worked with both BTW.