If you can hear the difference then why do you need a display of that?
So here comes the problem: audio mixer is usually set to highest audio rate your DAC supports. But for better experience it is recommended to set it to native rate of the source material.
That's why it is very beneficial to know what audio format you are currently listening to. You can then go and adjust the pipeline to match that format.
A mismatch between source and DAC sampling rates leads to an undesirable aliasing. This is the very same effect when you try to watch, say, 1920x1080 desktop screen on 2540x1280 LCD monitor. Audio is considerably more forgiving to such a mismatch comparing to video, but still this is a noticeable and undesirable effect, especially when you have a high-end audio pipeline.