Yeah, I guess I could have been more thorough with my response. It is not a purely aesthetic thing. Any race bike will have short chain stays, making heel strike an issue on just about any pannier. Also, most racing bikes will likely lack the necessary eyelets, so a rack would not only be awkward to install (P-clamps are a compromise at best).
Since the seatpost of such a bike would most likely also be CF, a seatpost-mounted rack would be a dumb idea, unless there would be a method of bracing the sides to prevent ANY rotation.
For a racing bike, a backpack is the best option IMO.

I've seen some CF commuter-oriented bikes, but that is a whole other discussion.

I'm personally a rack an pannier guy, through and through.