A true hearing test involves more than just tones. There are words spoken that the listener says back. This part of the test determines how well an individual understands speech. Speech is more important than simple tones. The Apple future capability may include this test. The Mimi app with simple tones is a start, but is not complete. The speech and tone tests are done in a sound proof room. Finding such a location in a home environment is impossible.
Once the tests are done, a very specific profile is generated. My devices adjust the sound in multiple points on the spectrum. How many frequency locations will Apple provide?
Those that comment about hearing aids, without ever having used such devices are guessing. My hearing aids can stream from multiple devices, including Apple devices. I can take phone calls. There is noise suppression. The battery lasts 18 hours with a 4 hour recharge. The custom fitted ear molds stay in easily and are so comfortable I forget I am wearing hearing aids. They can be expensive.
For many people that cannot afford custom hearing aids, and OTC devices are marginal, the Apple solution is a really good start and may be a real boost for many. Even though I wear hearing aids, I am excited for the arrival of the new capability of the AirPods.
If Apple provides equalization of music to match the hearing profile, that would be awesome.