Another use case....
I have not yet "cut the cord", and currently have OTA, Cable (via TVE), and Streaming sources feeding in to Channels. Works great. But I would like to experiment, and see what life would be like if I dropped Cable. So it would be great if I could just "turn off" the cable source for a while.
Similarly, there are times when my OTA feed is compromised, e.g., during recent heavy snowstorms when many channels were pixelating and many recordings were "interrupted". It would have been nice to easily "turn off" the OTA source so that any recordings would pick up shows which happened to be available from other sources such as Cable or Streaming.