Something like that shouldn’t be a option in racing games. That’s why even the normal Forza hasn’t that option. Music while driving would make the game even more arcade as it is in some sections.
As you said, you are still able to play music through other devices when you want it. And if you don’t wanna start a race only because you are not able to listen music to it, you are on the wrong game I‘m afraid.
Something like that should be added since it doesn't make a game more arcade. There is no rule in Formula 1 that states that you can't listen to music while driving. Also, its an option to put it on and it's not on you to decide what people want to listen to whilst driving.
