[mmmBacon]

I have 15 year old vehicles. I listen to the radio in all the cars I drive as does my spouse. The receivers in our vehicles are too old to have Carplay and with the removal of the audio jack in phones there's no way to connect them to the audio system. We do have one vehicle that can stream over Bluetooth but it can be a hassle and distracting in traffic so we usually only use it on road trips. Locally it's easier to turn on the radio and use presets (you can feel them!) to change the channel when it gets annoying. It just works mostly.

[dredmorbius]

USB FM broadcast dongles exist. They transmit at ultra-low power, usually with the option to switch between broadcast frequencies (in the event of interference), and permit your digital device (smartphone, tablet, laptop) to transmit audio directly to your car's stereo. Playback controls are on the device, you can of course vary volume or toggle playback on or off from the vehicle's sound system.

It's not fully-integrated bluetooth or audio-in, but it does work and is an option.