I think I understand.
Feedback was never a problem though when I used my open dome Siemens 8 years ago.
And feedback is not a problem with my current Oticon intent 1 on trial.
I see the point that the risk of feedback increases when speaker and microphone are close to eachother as in M&RIE… but I thought modern software took care of that problem.
(I do understand that the problem increases with rising amplification.)