A recent change added this feature
New and unread message lists - easily see what messages have come in that you haven’t seen, even if another group member read and archived it already.
This makes total sense for group inboxes, but for the personal inbox, it means that every PM I’ve ever sent now shows up. My workflow until now was to archive the messages in my personal inbox after I replied/dealt with them (a la gmail). I know I can bulk select them and archive them, but I’ll also have to do this for every new PM I send.
Would it make sense to revert to the old behavior for the personal inbox and keep the new behavior for the group inboxes?