I see the point, but I am disinclined to make a stink. Trek has been pretty accommodating; frames wear out and I believe this one did exactly that. I am convinced that CF does not a make for a lifetime bike for a racing cyclist. Trek has the balls to offer a lifetime warranty on a CF frame; it means they are not targeting racing cyclists that put a lot of high stress miles on the bike, and their decisions on geometry offerings, groupset offerings (other than their 6.x series, their bikes all come with compact cranksets), etc, reflect that choice. They accommodate racers simply by swapping the worn out frames every several years until the frame dies in a crash or the racer loses interest. I'm not trying to get ahead on the transaction. To put it in perspective, my Velo Vie race frame (great frame; as stiff as a Cervelo is aero, and marketed for racing) only has a 3 year warranty.

Besides, I looked at the geometry numbers pretty closely; I can make the 56 work fine just by moving the saddle back a few mm. They get the smaller frame by steepening the seattube by 0.3 degrees and slacking the headtube by 0.2 degrees (and, of course, lowering the top tube by 2cm). I can get the exact same fit by moving the saddle back 4mm and the handlebars forward 4mm; since stems don't come in these increments, I'll just move the saddle back 4-6mm and call it good.