Oh, I love this line of thought! However, I'd switch it to be multi-modal, i.e. not just "median orientation of earbuds over time", but also ___. Specifically,

Oh, I love this line of thought! However, I'd switch it to be multi-modal, i.e. not just "median orientation of earbuds over time", but also ___. Specifically, one more example, people need to use their AirPods with a TV because the rest of the household needs quiet. However, there are typically speakers already set up "correctly" oriented (especially with surround sound). The AppleTV and AirPods could automatically communicate through the individual speakers (at frequencies we can't hear), to correlate the user's location/orientation in relation with the "optimal sitting spot, based on audio".