You may care when you grow older. Looking at the reflection on a physical mirror of something far away is very different from looking at an image of the thing displayed on a screen close to your face.
On screens replacing side windows, I don't have first-hand experience. I see them on trucks and some fancy Audis -- but since I know for a fact that Audi designers are dangerous, well organised people trying to kill me with their safety features, I avoid their cars religiously.
Unless you're using a backup camera...
I mean, I know that this seems like a pedantic and silly quip, but the point is that doing actual safety analysis requires careful thought and precise decisionmaking, and the stuff you're doing here is exactly the opposite of that. Slow down, say what you mean, measure what you think is "obvious", and be prepared to be slightly wrong on the margins.
And to repeat my second point: the industry as a whole has been getting inexorably safter on a decades-scale trend. So my prior is to treat arguments of the form "The Auto Industry Sucks And Is Making Everything Unsafe" as ill-founded absent real evidence to the contrary.