Yeah, that part I understood perfectly already. It’s not just Phonak, but all aid brands do this to their traditional feedback manager like you said.
The part I don’t understand, and nobody has been able to explain to me, is that @DamonHill claims that REM was required in order to “unlock” some further gain in the highs that the Phonak feedback manager “has locked up”. I didn’t know that simply doing the REM adjustment would enable anyone to “cheat” the feedback manager into getting more gain than the feedback manager allows, at least without any consequential result like causing feedback to resume where the feedback manager was trying to avoid by locking up the gain in the first place.