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I did it for a few years, back when I had a new car with the capability but not a phone with a good mobile data plan.

It had the benefit of an information center with physical buttons too, so I could navigate around my library without touch screen madness or voice commands constantly failing to understand band and song names.

We haven't met yet.

We use an USB key full of audio books: Harry Potter saga and The Quest of Ewilan among others. The whole family is hooked.

The car UI is much more reliable (no phone to unlock by the copilot, no Bluetooth disconnect). The phone battery is spared for navigation purposes.

I have 256GB of FLAC in my car, and it's great.