Is an overthinker mediocre?
Because the not-very intelligent see a simple world, the moderately intelligent complicate things, and the very intelligent simplify things. And being simple / simplifying is a defining craft of our game. — Jim Carroll, BBH.
Why people Ovethink ?
Every people that see complicated thing and cannot simplify that thing always Overthink.
It’s always happen to Mediocre because they can see all thing and they don’t have ability to simplify it, so they can’t solve the problem.
And not-very intelligent just see simple world like true and false or black and white. That make easy to them to take decision because they don’t have many variables to consider.