Re: What's DAB for?
I think you have a point. The use case is going away on the assumption that everyone will have radio apps on a device and stream from them to your output device (speaker, in car stuff etc).
If you don't have a smartphone with a large data allowance you're not like the decision makers so things will no go your way. Decision makers all have large flagship phones with unlimited data paid for by their businesses and live in well expensive connected metropolitan areas.
I imagine their solution to your problem of poor reception etc is to get a large smartphone with unlimited data paid by your business and move to an expensive well connected metropolitan area. Because...why wouldn't you?