... it's one-way communication.
That's also one of radio's strengths. Sure there are times you want to interact and participate. But other times you want to relax and simply be entertained -- maybe close your eyes, or have them fixed on the road or some other activity.
Radio needs to capitalize on it's strengths ... not try to be something it's not. That's the point. Focus on entertainment ... not everything else. Loss of focus is what sinks many businesses.