Preserving the viability of simple radio circuits that might receive public safety messages and the towers that can broadcast to them is a concern that operates on a different level than "will it make the car cheaper" or "who even listens to AM"
A lot of the systems and technologies that we've grown used to and rely on for our daily needs are extremely capable but also extremely fragile and brittle. Keeping backstop technologies from being lost altogether is fairly cheap and might make a significant difference if and when crises do arise.