Ok, understand. A little bit disappointing.
"Signal would probably refuse to weaken their security to allow interaction"
Yes that would be my next idea. If Signal 'allows' having contacts without encryption - would than a connection between 2 persons from telegram to signal imaginable?
I mean it could also be that this hardcore encryption will not all the time be allowed...?
And of course I agree that everybody should choose them freely - but actually one actor you can only install until you agree that he reads out your contacts and what you do on the phone - here we are not on a normal market I would argue. Not normal markets normally results in not normal regulations - we are only missing until now.