It's the same form as inventory management in a warehouse: you don't optimize the placement of each screw in the same way as you optimize an entire pallet of goods.
The idea that local events are always a major component of travel planning is too general and does not take into account realities.
For example, for a business trip where the goal is a specific meeting, the impact of events is a second-order variable unless they block access to the destination, making the analogy of adaptive storage more relevant.
The hierarchy of planning is not stable; it is situational, like the layout of a warehouse that adapts to the value and volume of items.