I'm writing an org wide message and I want to list myself as a point of contact. I know the mouse over displays detail about me for posting the mention. If I was able @mention myself the mouse over would include more information as well add buttons for them to message or email me.
Gabe Freeman commented
Also, if you are using Meeting Notes and are the one notetaking for a meeting, it would be useful to be able to tag yourself for tasks, comments, etc.