sorry, i should have clarified what i was talking about.
(disclaimer, i'm not a pickup designer)...
i am assuming (potentially incorrectly) you can make the coil longer if you wanted without having to make it thicker. in other words, the coil would simply extend beyond the last pole piece... there would be some air space between the end pole piece and the inside of the actual coil at that end... implying some "dummy" bobbins to run the coil around (as if there was another pole piece out that far). that would give you more wire, but i assume the same number of turns.
i'm not sure if that is practical, but it would have tonal impact of course, which i suppose could be good for some people. otherwise the only explanation is to fill routes, in which case i'd ask why the heck were they made so long? super duper blade of some kind previously installed?
i should add, i'm assuming any reason for doing it is based on functional/dimensional need. if this is purely cosmetic, just for the sake of making the pickup visually bigger with no functional requirement, then i (personally) don't like it.