I had another phone that broke. So I went back to my iPhone 5S that still had iOS 10. I didn't want to update because I figured it would make the experience worse.
To be honest, I don't know if my significant other's phone (iPhone 11 Pro) can even connect to my car anymore through the cable. (Bluetooth being the only other option - which has significantly worse audio quality and issues like static or something of the sort)
Upgrading OS is the main source of frustration and time wasted in my pro-audio world. So I salute you - iOS10 survivor!
Note - listening to audio in cars, it's a compromise. It's never ideal, so I wouldn't sweat the quality - but you're right to question the reliability.
Use the good old, eco-friendly, headphone jack!
(All consumer wireless is ONLY instigated by Apple because it is cheaper for Apple, but consequently a poorer, less eco, experience for the world)
To be honest, I don't know if my significant other's phone (iPhone 11 Pro) can even connect to my car anymore through the cable. (Bluetooth being the only other option - which has significantly worse audio quality and issues like static or something of the sort)