Not exactly, in my opinion. A true sequential will just go to the next highest or lowest gear, regardless of the derailleur combo needed to get there. Combine that with the existing di2 programability, and a hit and hold on the button can take you up or down a predetermined number of steps.

Currently, the way I run di2 my front and rear derailleur switches are set up so that I can hit both at the same time, with the one hand I have available to me. 9 out of 10 times, when I change the front ring, I couple it with a hold on the rear button that moves me three cogs. 1 out of 10 times, I just shift the front and take the 16 tooth jump, and then fiddle with the rear.

In order of preference, I would love to see a true sequential. Second is the automatic movement of the back to lessen the blow of a ring change. Third is what we've got now, which is still pretty darn cool for an adaptive rider.