I’ve got a few staged users that regularly interact with our site. Several are automatic emails (e.g. from Digital Ocean, AWS, etc). It would be nice to have them easily identified in the Message inbox.
Digital Ocean have a Gravatar, and a very helpful image is applied to their avatar even though they are staged:
Because gravatar comes from email address, but custom avatar should come from user, and that can’t happen, because that user is staged. And no one ever build system where an admin can change avatar for staged users.
Just guessing, but you already knew that possibility.