Actually there wasn’t. Cars were supporting the iPod protocol for a couple of years before the iPhone came out - meaning you could see the song that was playi

Actually there wasn’t. Cars were supporting the iPod protocol for a couple of years before the iPhone came out - meaning you could see the song that was playing, change to the next track or playlist from the head unit. The iPhone still supports that protocol. I could navigate through my podcast player (Overcast) from the head unit of my old car