Get what you are trying to say but both are still encrypted. They simply aren’t end to end encrypted. So the messages are private. Until obviously the company servers get hacked or police raided and the keys to the encryption get stolen. You are protected against this in E2E encryption. True.
Ii guess telegram once was the alternative to whatsapp, then made maany more featutes abailable in fast time paces which led to another bunch of migrators.
Now noone wants to move away because why? For the usual end user there is no negative to them.
I am fully on your side and am using signal and matrix and try to migrate as many people as possible but its hard.
I know its a absolute wonky workaround but you could use a second phone and enable google speech input – or an FOSS alternative: FUTO Voice Input (Local LLM Model that works pretty great. Better than google imo. Is better finding the correct words and also putting logical punctiation. – as in when should a comma or dot appear.)
Now you enable speech input on one phone and playback the voice message of the dude on the other end. Now you got all the text.