Further to comments today, I looked in detail at the ‘flying bridge’. The groove running parallel to the rear door frame is part of the problem but really is a little problem on top of a heap of more fundamental ones.
The last image shows the most basic interpretation of the boxy package with a simple D-pillar. What else could they have done? Much more could have been done with the rear lamps. They could have been vertical, for example.
With that last doodle I only want to show what an unadorned, obviously van-like profile might have looked like. I agree it would have been uninteresting. But the cure was worse than the disease in this case. Another of the sketches shows the car made lower by about 10%. I moved the A-pillar back to align with the axle. It’s a bit of a bodge so don’t look too hard.
I get the general impression that the methods of making an estate-car look less boxy were applied to a van which is how the actual car turned out so wrong. The identified a ‘problem’, applied the wrong solution and did it badly.