The app's volume controls (which are wired up to AVPlayer's) don't do anything, and the AVRoutePickerView shows the device's volume controls (which at least with Roku TV, are wired up to the TV volume directly).
The app should either hide the volume controls, or direct them to the AirPlay device. Annoyingly, the RPV also shows the device volume, but not the Mac/AVPlayer's.
The app's volume controls (which are wired up to AVPlayer's) don't do anything, and the AVRoutePickerView shows the device's volume controls (which at least with Roku TV, are wired up to the TV volume directly).
The app should either hide the volume controls, or direct them to the AirPlay device. Annoyingly, the RPV also shows the device volume, but not the Mac/AVPlayer's.