A few things. Can’t remember who said that when Caroline came back in 83 the gear was obsolete. At that time there were literally thousands of radio stations in the USA using kit exactly like that. And it doesn’t really matter if what’s produced is good.
648 works for the people in its catchment area. For App users in the car, 4G is patchy between villages. 648 in the car enables them to keep listening. It’s pretty good here in Kent near Strood.
For my journeys, 4G bluetoothed from phone to the car stereo works brilliantly. I’m usually in motorways and it’s pretty solid. The London DAB is pretty good too.