Bez, not back pedalling at all, Look at the marketplace, for the price of my Lemond you can get a much lighter carbon bike. So on that basis it is heavy. But 19lbs by any normal standard is not heavy. Its 6lbs less than my MTB, go back to the days of 531 and it is a fair few pounds less. Even the early Cannondale 3 series and Trek OCLV road bikes weighed more.
Would i try and actively save weight off my road bike, NO. I have the cheapest campag cassette on it, it is 9spd. it uses a square taper btm bracket. Will i change bits, yes, in due course i would like to fit a full Athena Alu groupset because it is aesthetically better than the carbon stuff. Which i guess sums up my attitude to road bikes.