It's a great idea to have the camera hidden to keep it clean. Not sure I would trust BMW to implement it in a reliable and easy to maintain manner though. Those Munich engineers would come up with some ridiculously complicated Rube Goldberg implementation relying on a hidden iDrive setting and a dashboard scroll wheel you'd have to adjust depending on the weather. And then marketing would make the whole feature an extra cost which you could bypass via coding which would get wiped every software update. And then to replace the camera you'd have to remove an underbody panel and drop a subframe to access the mounting point.
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