Thanks for your comments.
Apple didn’t introduce MFI because they care about people with hearing aids. MFI will generate licensing revenue, which is what Apple is all about. Despite that, Apple did a good job implementing MFI. The integration is seamless and reliable. It’s based on BLE, so it’s easier on batteries. Out of the box, BLE does not support audio streaming. MFI implements audio streaming over lower-level BLE services. MFA does the same thing.
The Bluetooth Classic profiles for headphones, headsets and audio streaming are quite old and relatively primitive compared to BLE. There are no equivalent services in BLE, so it’s up to the device manufacturer to define the services, which is what MFI and MFA do. BLE has the advantage of being low energy, so it’s probably the what you should expect more of in the future. The big problem with MFA for most people is unless you own a phone that will get updates, you’re out of luck, thanks to the fragmented Android ecosystem.
If you want to read about MFA, here’s a link: Hearing Aid Audio Support Using Bluetooth LE | Android Open Source Project