I can't comment on this new app yet but I'm a near daily user of the regular NPR app (which I think is officially called "NPR news"). It's way better than any generic radio app I've tried.
Besides listening to the individual local stations, you can also get the latest news (the ~4-minute hourly blurb), can create playlists of entire shows (without the interludes, i.e. just the content), and built-in news articles (for reading, not listening). I've even used the local NPR station finder to help me tune an analog radio when in a new city where I'm not familiar with the local stations.
It'd take quite a bit of agreement on content licensing and data formats to have anything like that be as usable as the NPR app across multiple content providers.
> Seriously - why does everyone assume that if I want to listen to e.g. NPR, I only want to listen to NPR?
Well some of us do :D