That’s fair, though surely the metadata does go near matrix.org if either you contact people on matrix.org’s servers or use the fallback for calls since a lot of servers don’t have their own TURN server for that.

I thought Signal didn’t really have much metadata or is it more that it is extremely temporary to the case where it doesn’t matter?

And yeah, definitely agree that most extremely private (or at least marketed that way) messengers have a terrible UX and in a lot of cases UI too.