We are living in a world where everything is about maximizing. Be it productivity, wealth or happiness. We are so lost in this race that we end up sailing in many boats at the same time.
It does not hit us in the initial days of our journey as we self gloat about our products but as we progress we end up being a headless chicken.
Our human mind has limited resources, letting our mind wander is not a bad idea but focusing on one thing till the end is what makes us productive.