Yeah, there could be a number of reasons engineers change designs. I haven't heard the "serviceable part" explanation, but I guess it could be. It could even be do to the lines of the vehicle the curve of the glass starts its curve very near the bottom. It may have nothing to do with part preservation at all. I guess the straighter the door the more likely it could rub the seal al the way up. (like a van or a pick up). It is difficult comparing brands, just as much as comparing models of the same brand. As the old saying goes, it's comparing apples to oranges. My Mazda CX5 does not clear the windows either. It was a bummer when I first tried it. Especially after having my 1994 Mazda B4000 pick up clear the windows. Have a good one!