Depending on your preferences, there might be a problem with the CEC function usually built in to new tv’s.
Casting to the CC will turn on the tv and display the content, that the app usually shows - sometimes interesting, in other cases boring, annoying.
And not everyone will want to have the screen on, when listening to music/radio...
It is not always possible to turn off the screen.
CEC is smart, but can in this case be something, that is unwanted.
This - of course - is not the case with most B&O tv’s (since there is no CEC there).
As already noted (on a BV8) you could turn on the CC-input port with an AV prefix.
How this will work on later BSys4-based BV, I don’t know - and I am not able to test it, since my CC hasn’t updated yet.
Here you could Mute the screen - however, if there will be a delay due to the sound processing, will be interesting to see.
With casting you can’t just add a room/device like NL-users know it (the join function).
The only way is to change the group to another group, that includes the wanted room/device.
This means using your phone/tablet and the app each time you enter a room, where you want to ‘listen in’.
And there is also no way to distribute the sound to another device (keeping the picture on the tv)....like ATV/AP2 users know it.
Casting still has some drawbacks - there will be costumers, who will be pleased using it..........others - used to the simplicity of NL-distribution - maybe will be more sceptic.
MM