I have finally discovered a downside to Di2. I have been riding Di2 for about a year and have found nothing that it really can't do. Shift under load, no problem - whatever I ask it does. The problem is that is creates very unrealistic expectations for my other components. I have just become accustomed to getting what I want when I ask.
Case in point: here is my Dura Ace 7800 front derailleur after I asked it to downshift at the top of a hill yesterday.
No, the cage is not supposed to stick-up in air in two pieces like that.
Was I upset that I was still 12 miles from home? Not really, I just had to man-up and ride home in the larger chainring. The drive train does not owe me much after almost 17,000 miles of service. I just need to remember that all bikes components are not equal and I need to adjust accordingly when I swing my leg over a trusty steed.