Actually we would not use CF on the boats we built because of the brittleness and lack of flexibility. CF is useful if you are trying to ward off a single blow as opposed to repeated flexing as it tends to fail under continuous impacts IMHO.
My confusion is from another thread I am currently on at another website where the conversation is around the avoidance of using foam core on running surfaces. Foam tends to contract after repeated impacts leaving voids in the sandwich which could lead to delamination.
The simple fact is that there are different strokes for different folks and some builders have better experiences with certain materials, or are able to compensate for certain tendencies with compensatory modifications to the layup schedule. The fact that I don't know how to make something work does not mean that no one else can.......... But certainly questions should be asked and answered to satisfy the end user.
T2x