The more complicated
The more complicated something is, the more opportunity there is for failure. How often do computers crash? Think of all the tiny components on a circuit board. Each component is needed for it to work properly. Each component has the possibility of failure. Each component is susceptible to things such as temperature, vibration, voltage etc. Then we have the software. All those lines of code, and it only takes a single part of one of those lines of code to cause problems for all of those other lines of code.
Think about how reliable things such as the uconnect are (not very). Then think about having all that stuff wrapped up in a metal cage with you barreling down the highway at 60 or 70 miles per hour with 50 other cars just like yours in your immediate vicinity.
No thanks.