I'd love to use my Q8 as radio receiver or stereo system. The audio quality is Superb and it takes a lot less space to not have separate tuner.
So my proposals are when using e.g. Spotify, HDMI Input, Tuner etc, to press a button to close the display put leave the audio on.
This could be also combined with the Decor -option, to have the originally selected sound and Decor on display.