[viraptor]

There definitely are concerns which shouldn't / don't need to be shared widely, when they're about specific people or about interpersonal issues. There's also potentially lots of stuff that should be communicated to the team, but they don't need to know the details of the issues. You definitely don't want to start a "John is avoiding work recently" conversation in a group, exactly because everyone can hear it and respond to it. Maybe the manager needs to have a private chat with him, or maybe the manager already knows that John had a death in the family that affects him. Not everything needs to have more people involved.