Goals and plans look good on paper. They seem reasonable, as long as we stay largely unconscious of what, along the way, could be uncertain or unpredictable. Goals and plans are typically based on all manner of assumptions. Their validity is based on the assumption that reality cares what we assume. Goal and plan failure is essentially reality's failure to stay compliant and loyal to them.
The problem is that reality has no problem being uncertain and unpredictable. It's prime constant is change. It likes to reward the mindful who consider change as an asset, and to punish the mindless who consider change a constraint.
This is why we instead organize life's chaos with fluid interests and responsive paths.