The purpose of this condition is to allow an automation that can alert another technician that a ticket has been assigned to them but not if you are becoming the assigned tech. Currently there isn't a condition of "Self" that would stop the automation from running when assigning a ticket to yourself. (Example: A tech is out on PTO or needs to assign a ticket to a different tech. They make the assignment change and the rule emails the newly assigned tech.) That works just fine but without the Self condition, when I assign a ticket to myself during standard ticket processing, I receive an alert which I don't need.