Automotive screens sizes are small because they must exceed vibration and temperature tolerances of other devices, which drives up cost. Unlike an iPad, in-car screens need to work from ~0F to ~130F every day, because the back-up camera MUST work.
When Tesla introduced giant screens, then ran into problems with panels not being "automotive grade."
See: https://www.thedrive.com/tech/27989/teslas-screen-saga-shows...