This is always weird to me when sending a direct message.I think got removed somewhere around v2, but I use these features all the time on other services (Slack, Twitter, We can either not require itFacebook, like previous iterationsetc) and name the room (participant a,we have no equivalent. bI think you can maybe do something like this today with locking down a Policy on a room, c) or separate out DMs and Rooms.it's cumbersome and not super user friendly like other services.
As a baseline example, I'd probably lean towards separating themthe designer Slack chat I'm in sends about 10k messages a week with 30-50% of them direct user to user.