No one is doing that, unless you think the Spec Tarmac or BMC Pro Machine are comfort frames. All we're doing is trying to find geometries that work for long-legged, short torso riders, without worrying about how marketers choose to classify those frames.

Your point about external headsets is very well taken, however; if the C-50 I cited above has an external headset, then yes, that will put the effective HT tube length right up there with the Specialized, Ridleys, BMCs, etc, making it a decent choice.

Which just serves to highlight how deceptive a simplified approach to geometry can be. We haven't even talked about different axle-to-crown heights in forks yet...