Because the me from the future would not visit the me in the past.
Let me explain why I would never visit my past self: If I were to do so, to tell the past me to either do something I didn't do or to not do something I did do, then (assuming the past me listens), then the present me will then have done or not done whatever it was, so would not have visited the past me to tell the past me anything...time paradox.
How could you not understand how easy it would be to cause a time paradox by visiting your past self?
I want my old avatar back...
I wonder if anyone will bother trying to read what this says.