They do, but know what works better? A single panel in front of you with all the views - you don't even have to turn your head.

As someone who's raced, "Wink" mirrors demonstrated this fantastically: multi-panel rear-view mirrors where you could see everything behind and beside you in a single mirror.

I used one in my daily driver when I had a neck injury (whiplash) and could barely turn my head for 2 years. Way easier to see all around you, and better too.

The tech for a camera system has been available and trivial since the 90's. A single 4" tall wide screen on the dash, or built into the center rear view would work.

Clearly you've never driven in rain, snow, fog. Side mirrors are very problematic. Cameras can be better protected, and done right even deal with rain and ajow a lot better.