Jeremy

actually the cable routing is optimized for Tri bikes and bikes like Giant propel,merida reacto, New Cervelo S5, Felt AR di2, top tube entry frames,e tc

With a cable stop built into the stem for front brake and future cable routing it does improve bikes aerodynamics and cable routing.

Also, where are TT bikes hosting Di2 junction boxes? The stem caters to that need to fit both 5 port junction boxes or the new bar end version with access from outside particularly for tri bikes.

If you are using a standard BTW bottle and cage it will be faster. If something like Profile FC35 I can't say.

Using torhans you prob have aero gains as the torhans is so narrow the stem is still visible.