No offense, I'm just curious... what is the difference? If you want silence, mute the radio or better yet turn the volume down to zero so it doesn't come back on when you start the vehicle.
I remember when iPods came out... people were complaining that there was no stop button, only a pause button. On a digital device... it's the same. I know the music app on my phone does not have a stop button, it only toggles from play to pause. These infotainment systems are computers with a radio app built in (over simplified, but basically)