And Element are consistently just not working in various ways, different every time. For example, recently I tried to join a room address from another server and was told "can't join that because a server address wasn't specified" but another address on the same server says "room not found" so it clearly did know the server address.

And there's the whole thing where you have to always be signed into at least one device at a time. If there's ever a time when you're not signed into any device, you have to reset your encryption key which means losing access to all old messages plus sending a notification to everyone you're in contact with. And I've had times when the reset button also just didn't work, throwing some error, so I was just locked out.