Proponents of endurance frames are coming out OP. New Roubaix owner. I am older than you and ride more. The Roubaix SL3 is the fastest bike I have owned and I have owned a lot of bikes. It ain't the bike as long as its stiff...its the rider. The Roubaix SL3 is uber stiff. As to position on the bike, a guy with average flexibility...or slightly less in the case with my aging self will be faster on an endurance frame in spite of being less aero. This is because an inflexible rider when stretched beyond his limber zone will put down less power. This is notable in particular in the drops. I have done the testing. I say for the 'average' road biker a bike like the Roubaix is preferred. Cat 1-3 guys or pros may want a more aggressive geometry. I have a Cat2 buddy who also isn't flexible who races a Roubaix. Perhaps the predominant reason that many go to hybrids or mtbs is because the riding position on a std road bike is too aggressive. Endurance bikes change that. I can keep up with all but the very fastest guys. Its about the motor so why not enjoy the ride.