It's actually more dangerous not enabling more apps into CarPlay. People will use these apps regardless and picking up the phone to select an app, play the audio from a YouTube Video, picking up the phone to select a song or an album by an artist Siri won't find for no reason, etc. is much more dangerous than having hands free options as people will use the apps anyways. Allowing shortcuts to run apps even if they don't show up on the CarPlay screen is FAR safer than someone having to do the same thing by picking up the phone.