Yep. My new car has a digital rear view mirror. You flip a switch and the rear view mirror becomes a screen showing a feed from a camera on the back of the car. It’s nice for night time as well as when the rear window is blocked by rear seat passengers’ heads, or cargo or whatever.

But it’s uncomfortable for me because it requires my eyes to refocus from distant to close and back when I glance at it, which isn’t needed with an actual mirror. So I don’t use the feature.

Once I had a rental car (a Nissan) that only had a screen instead of a mirror. It was absolutely useless since the resolution and dynamic range were too low, and as you mentioned, you have to change your focal distance which drastically increases time/friction to check the mirror.

I found myself actually using the incidental reflection on the surface of the screen instead of the actual pixels. I can't believe this arrangement is legal.

Wonder why they don't optically refocus the display at a distance?

There are ways to do stuff like this.