[kazinator]

I would say, what is also lacking are resolution, dynamic range, and latency. Regarding the latter, even if it's a closed circuit analog system with no digital buffering, there is still frame refresh to consider.

At night, if the display isn't dark enough, it will act as a light source, interfering with the driver's night vision. Black has to be black, and dark objects that would be visible with the naked eye via mirror had better be visible with the camera.

[tobtoh]

I'd assume this isn't really a problem these days? Aren't OLED screen capable of high resolution, dynamic range (include true black) and low latency?

The main issue would probably be cost, but at a technical level having a suitable screen for car mirrors shouldn't be a problem.

[Piskvorrr]

Yeah, throwing money at it could realistically bring this from just-around-the-corner FM to Actual Machines. Not quite there for COTS equipment yet, for cost-saving reasons (fast processing needs beefy HW, which is expensive in itself, needs higher and smoother power, cooling, etc.).