[omasou]

I wouldn't say that a carbon roof is a M signature item.

The M performance accessory line is BMW going after $$$ that they use to leave on the table for aftermarket brands. I usually prefer OE so I see it as a good thing as long as it is form over function.

Perhaps BMW is offering the roofs on other models so that can increase volume and reduce costs. Also having them on more models will help to surface and confirm problems so they can improve over time. Both of these things will benefit M cars.

Or maybe it's a secret plot to stop making cars w/sunroofs & moonroofs. hummm