FWIW, slack has this issue as well. It might because unlike IRC, every DM is a room and has similar resources, and 50 people messaging you is the same as joinin

FWIW, slack has this issue as well. It might because unlike IRC, every DM is a room and has similar resources, and 50 people messaging you is the same as joining 50 rooms and I don't have the patience to "leave" a DM.