You are right in that go develops the mind in a well-rounded manner. Emotional balance is important in many sports but in go it is crucial. The space of possible moves is so vast that, particularly in the opening and the middle game, there countless possible strategies. Too much aggression or fear lead to defeat. A player must strike the right balance between the two. If the situation requires, a player will have to turn their thinking upside down and devise another strategy better suited for the overall situation. At every step of the way a whole-board evaluation must guide the choice of moves. It is cognitively hard but clinging to ideas will show and a skillful opponent will use that against you. For example, if you demonstrate that you absolutely must have some piece of territory or a framework and your opponent judges that they can afford to give them to you, they will try and extract maximum price for that. The stronger a player is the longer they will put off commitment, only committing to a strategy at the last moment.