Re: There are plenty of reasons NOT to use IP
"2) multicast is your friend"
and the router bandwidth that it would require is NOT. Just sayin'.
On a related note, about 30-something years ago (in the USA) the AM band was almost dead. NOBODY listened to music stations on AM. There were attempts at AM stereo, but it doesn't address the fundamental problems. Quadrature detectors in AM receivers help a LOT, but you still get a lot of noise. Yet, just about every car still has an AM radio. Why?
Well, AM was basically saved by the news/talk format. Rush Limbaugh, Sean Hannity, MIchael Reagan, Dr. Laura, Glenn Beck, and many others [including local talk hosts and nighttime shows like 'Coast to Coast AM'] basically re-opened the AM band with shows that people could listen to while driving, working, or whatever. For drivers, there are the frequent traffic updates. And so AM is still "a thing" around 100 years after the first radio transmissions.
As for FM, digital exciters can improve the quality on the modulation side, and digital music playback in the studio gets rid of the pop/hiss/scratch of vinyl. FM quality is extremely good (at least here in the USA).
This is all because AM and FM broadcasters (including the PBS and college stations) need to compete for an audience, here in the USA. I'm not sure about how the BBC is set up, but it seems to me that there isn't a significant amount of competition for them on radio. That's probably the driving force for 'change' even when 'change' isn't for the better. You know, like what Micro-shaft did with Windows "Ape" and Win-10-nic.
(I'm quite happy with FM radio quality and AM programming out here on the left coast of the USA, and the fact that ancient radios can still receive it)
/me wonders how you can teach electronics to a kid when crystal radios no longer receive anything?