I am now a big fan of 1059 event (Vitor version @Vitor Pamplona )and #0xchat app also makes extensive use of 1059 event: sealed DM, secret DM & voice and video call signaling events.
In the upcoming version, it will continue to be used, with private group featured next.
Perhaps we do need to find a relay that can perfectly support the 1059 event requirements.