According to Cervelo:-
Moving the bottom bracket closer to the ground lowers the bike’s centre of gravity, improving stability and handling. Longer chainstays, a shallower headtube angle and additional fork rake increase trail and boost tire clearance, allowing for a wider range of tire sizes and room for a fender. All of this also produces a very stable, smooth and reliable ride.
Longer chain stays yes, curved maybe makes a bit more flexible , not quite sure. It certainly rides well.