People exaggerate their confidence in their plans - something we call the planning fallacy... The existence of the plan tends to induce overconfidence.
A plan is only a scenario, and almost by definition, it is optimistic... As a result, scenario planning can lead to a serious underestimate of the risk of failure.
Except for some effects that I attribute mostly to age, my intuitive thinking is just as prone to overconfidence, extreme predictions, and the planning fallacy as it was before I made a study of these issues.
The planning fallacy is that you make a plan, which is usually a best-case scenario. Then you assume that the outcome will follow your plan, even when you should know better.
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