That is actually very interesting to me, because I recently set up a Samsung feeding audio into a Sonos connect amp. Usually when the audio appears at the connect amp input terminals, it can be set to automatically switch to that line input. In this case I wasn't able to make that happen, and I presumed it was because the digital output was remaining on. I may try to turn the HDMI CEC off next time I am at that project.
There is no truth anymore. Only assertions. The internet world has no interest in truth, only vindication for preconceived assumptions.