show copy of phone screen on the display via miracast/chromecast/...

This would bring a lot of additional apps to the big screen without implementation effort for Tesla. Video streaming, incoming messages other than SMS (Threema, wire, Telegram,...), video conferencing, city parking guide, airport/station arrival/departure times in realtime, office apps, ...
In a small window while driving, expandable to fullscreen while in "P".

 

.