The network layer of all internet servers reveals almost everything you listed. Signal has the same problem, and there's nothing they can do about that. The only way to avoid it is to use a completely peer-to-peer model (Matrix has started work on this, btw) and avoid communicating across network routes that can be monitored.
There might be one exception, depending on what you mean by "Accounts": The user IDs participating in a room can be seen by server operators and room members. But then again, server operators can already see their users' IP addresses (which is arguably more sensitive than a user ID), and I believe room members have to be allowed into the room in order to see them. For most of us, that's fine. Far from a disaster.