Had to revive this thread. Last year I saw frames involved in race crashes that normally would have survived, but didn't because the tubes were simply too thin to handle the impact they received. One fella slid out in a corner and hit a bale. The down tube split open.
Anther fella got tangled with the rider next to him, his right foot popped out of the pedal, slammed into the left chain stay of the guy next to him and took out a 6 inch section of the tube. There are more stories.
The point is a stout, 1/2 pound more material in those frames could possibly have resulted in less damage. Yes, I bet Colnago knows what will survive in the environment they cater to and it is not stupid light frames. The other companies build them for little money in China and can afford to sponsor crash replacement programs. They still make money on the replacement frame! Incidentally, I never lost a frame in a crash. Only used metal frames for racing.