[jjoonathan]

Software updates aren't just for distributing first party malware, you know -- they could also conceivably be used to update a device database. We have the technology.

This is probably an "all of the above" situation. Implement on AirPods and push for a standard and make measurements of popular old models and have a fallback that assumes industry averages. On the scale of Apple, this is not much to ask.

[hedora]

Or, they could just make the volume slider run from min to max, instead of loud to louder.

Presumably the manufacturers already calibrated volume range based on the Bluetooth spec.