I have been waiting for this for a long time: finally hearing aids are on the market which can be connect to (Android) smartphones without any clunky adapters. It took so long, because Android only started to support low energy bluetooth (in Bluetooth 5.0) on Android 10.
Enno Lenze sums up the first experiences with it in this article (in German).
If you are wondering now “Didn’t Phonak do something like that for a while already?” The answer is: not exactly. The Audeo Marvel and Bolero Marvel do bluetooth to any phone without adapters, but they kind of bend bluetooth to their will. I have yet to test this in practice. We will see how they perform in contrast to the new Bluetooth 5.0 devices.