Earlier quoted context omitted.
In signal you cant delete/forget contacts... And groups will haunt you to the end of days too. I started to strongly distrust signal after I learned that. It's meta information nonetheless and invites for identity fraud. But yeah, Telegram can't be trusted either. I hope matrix/element will replace both soon.
Matrix needs better clients...
It took me at least twenty minutes to figure out how to add my friends to a room I created too long enough ago to have memorized the UI. And they added "Communities" which I created one of but cannot even tell what functionality it even provides.
I don't know if that's a client issue or not but it seems like (maybe?) it's trying to be a social network in addition to a chat app? Some kind of adding in Discord functionality or something?
I guess as long as I can not use social network features and still use it like I use Signal... to flexibly chat with whomever I know the ID of.