I can't speak for the DeRosa in question, but many road racing frames today are designed for racers: i.e. skinny guys who never carry any gear. They want their frames to be as light as possible. Makes sense if you are Marco Pantani. However, larger riders and/or riders carrying gear may find these frames to be overly flexible.
I had a customer with a Reparto Corse Bianchi built with Columbus EL (not EL/OS). The rider was around 190 pounds, and the frame was a 59. He encountered significant flex whenever out of the saddle and felt quite uncomfortable riding the bike. Bianchi's product manager confessed to me that anyone needing a size 59 frame was inherently too heavy for the frame and that the frame probably shouldn't have been offered in larger sizes.
Another time, a product manager was proudly describing a new 2-pound frame and then added "it's perfect for our pro racers - guys who weigh less than 150 pounds and get a new frame every year." I guess that company didn't want to tell this to the 210 pound guys who were complaining the next year on rec.bikes about how their frames broke.
I've ridden many very expensive "racing" bikes that allowed me to rub the chain on both sides of the front derailleur cage. These bikes are not designed for the type of riding that MOST customers experience. However, since bicycling is a fashion-driven industry, those are the bikes that we'll see offered in the market. Perhaps DeRosa was making a small step towards honesty.
Todd Kuzma
Heron Bicycles
LaSalle, IL 815-223-1776
http://www.heronbicycles.com