Its even a bit more than that rob. Comfort is really a benefit of proper fit and not a symptom. A rider is faster on a bike that fits him aka fit's his flexiblity. One thing not often discussed here...is an inflexibile rider on a conventional geometry road bike will lose power in the drops do to closed hip angle. When a tight rider closes his hip angle by lower the handlebar, he can't lay down the watts. So an inflexibile rider on a more upright geometry bike will lay down more power. The common misconception and what I call a myth is...that a lower handlebar means a more aero rider. Not so. A rider can only get so low based upon his/her flexibility. Handlebar position is really incidental. An uber flexible rider on a comfort bike will ride in the drops with bent arms with a flat back. An inflexible rider on a short top tube racing geometry will ride with his back in the air, because he can't get low. So the bike really is incidental to how a rider rides. The most common mistake I see isn't in handlebar height as much as reach. Too short a cockpit is bad for everybody...flexible or inflexible riders.