For Di2 I was thinking a 5 port junction in the nose would be far more simple. Then you could send a single wire to the A-Junction in the bento.
Indeed. Unfortunately, the B-junctions are only 4 port max! I guess Shimano did not anticipate TT bikes would have more stash space in front of a more rearward mounting spot for the A junction? Of course, you could put another 4 port B-junction under the stem. There might be room enough for that.
Yeah, standard stems make that a lot easier.With this bike, I would pop off the bars, unplug the Di2 wires at the B-junction that go towards the A-junction, then rotate the bars down and zip tie to the fork. There should be enough play in the brake cables to allow that. (Of course, there will be plenty of squishy stuff between those parts.)
Yeah, that'd be nice...but consider that when this bike was released, the only player with such a setup was the Trek with its draft box. I'd imagine that such an addon would have patent issues. The Giant came before the DB andean, p5x, new Dimond. Plus, these other three boxes have no UCI legal configurations. The Canyon managed to make a small storage cubby and remain UCI compliant, so no excuse for Giant.
I went to the UW tunnel with mine. But, that was just a single bike test. I can tell you that the aero bottle in the triangle was a good thing (for me at least).