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Depends where the exit holes are. On my Talbot the exit at the down tube / BB then go back in to the chainstay. Thank goodness. It's ducted. I think those CAADs route their inside the BB shell.
Huge pain in the ass getting the rear cable functioning as the exit hole on the chainstay doesn't point directly at the cable socket on the caliper, meaning it gets a shit bend that can only be achieved by removing the caliper, inserting the cable and outer, then squishing the caliper back on. Needless to say the rear brake does not feel tres bon, although it feels better now.
I wondered about this, and I suspect leavers for flat bars don't have different bar shapes to worry about, different hand positions and don't have to squeeze in a shifting unit that affects the placement of the pivot, and the designers can concentrate on just making them work for stopping.
That said my concern is less with raw stopping power, more with what an utter pain in the ass internal cabling is with stiff, compressionless outer.