The whole shift to digital for radio is a bullshit exercise. Radio functionality does not in any way increase in some measurable way by going digital, digital does not degrade gracefully and analogue radio used hardly any spectrum at all to begin with. I really don't see why radios should need processors, it was a perfectly good medium that served a ton of people with limited access to technology the world over.
The only reason this got rammed through in my opinion is that it allowed for DRM to be imposed on radio.
But there are some benefits which you didn't mention, such as including text & images in the broadcast for people without internet access, kind of like what Microsoft attempted a decade ago with FM subcarriers. There isn't that much bandwidth available for analogue AM radio either; using DRM would at least double that. And then there's the claim that switching to DAB allows for decreasing the output power, but I don't know if that really holds true in practice.
The only reason this got rammed through in my opinion is that it allowed for DRM to be imposed on radio.