How's that make sense? Do they only allow you to use a rearview mirror while in reverse too? It is the same view and no more distracting.
I believe you are legally mandated to have 2 of the 3 rear view mirrors intact and usable. TV screen, not so much. If I were looking at my in-car entertainment touch panel whilst driving and had an accident I would expect to be prosecuted for driving without due care and attention. Same goes for someone doing the same with the Tesla screen if not performing a reversing manoeuvre. I would not expect the same if I were checking my rear view mirror. One is deliberately placed within your field of view whilst driving so a quick upward flick of the eyes can check it, the other is down and to the side and considered a distraction.