Americans expect responsible, competent people to plan. Planning is not an unusual activity for special circumstances—it’s normal behavior that should pervade professional and personal life. The person who doesn’t plan invites criticism: they seem directionless, disorganized, or unserious.
The expectation is that professionals have career plans, organizations have strategic plans, families have financial plans, events have event plans. Not having a plan when one is expected is a mark against you.
If you’re working with Americans, meeting this expectation by having plans demonstrates that you’re competent and serious. The absence of plans where Americans expect them raises doubts. United States Planning