I'm just being facetious, but one possible reason that all the high-end models angle the drivers is that it is the fad of the day.
I tried jerg's method of angling the pads, but I had difficulty getting the plastic rings to clip in and gave up on it. The jergpad thread suggests that angling the pads makes some difference in soundstage and imaging, so you may be right, but IDK. Something about changing the reflections on the exterior of the ear?
You mean the sewing method I kinda mentioned some time ago? It really shouldn't affect pad installation though, just use the credit card or mini flathead screwdriver as per usual to pop in the tabs.
You know I have a mod recently written up about countering the backwave reflections off the ears right (signature)?