If all you are trying to do is finding the right podcast episode, it might be quite a bit better than fiddling with a screen.
But... cognitive load is a thing.
https://road-safety.transport.ec.europa.eu/system/files/2021...
The reason conversations can be held safely between the driver and with (some! people are different) other occupants in the same car, is that all occupants can asses what is happening and react to microcues from the driver in realtime. (Phone calls add many milliseconds in reaction time, plus the other person is not situationally aware.)
I do think an AI could help here though. This app isn't quite that. The AI would have to be very fast and responsive, notice with cameras and microphones when the driver needs a microbreak in the conversation, seamlessly continue when appropriate, perhaps be plugged in to the car radar and so on. Really be a polite and attentive passenger.