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The air drag contribution of door mirrors is tiny compared to all the other "bits and pieces" underneath the car, mirrors are also cheap and last forever, cameras deteriorate, an owner of an Audi EV with cameras for rear view is complaining about the cameras life expectancy of 18 months, at 18 months of service the image quality deteriorated to poor, they were not cheap to replace!
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BMW I3 owners have the same issues.
It's the quality of German electronics. Overcomplex, underdeveloped, unreliable.