The author expresses a sense of loss and longing for the days when they had to think deeply and struggle with difficult problems, which they feel is no longer necessary with the use of AI tools. They describe their personality as having two traits: the Builder, who craves creation and pragmatism, and the Thinker, who needs deep, prolonged mental struggle. The author feels that AI has diminished the need for the Thinker, leading to a sense of stagnation and dissatisfaction. They are unsure how to reconcile this conflict and find a way to satisfy both aspects of their personality.