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Well, you can configure the costmaps to include the respective sensors you want. So you can configure the global costmap to NOT have a laserscan, or to include it.

A use case for NOT INCLUDING the laser scan into the global costmap: The map is derived from a floor plan or mapped in a way that all possible routes are open (i.e. all doors you want to navigate through are open) and there is nothing blocking a potential path.

A use case for INCLUDING the laser scan into the global costmap: Your map has some objects that might have changed (e.g. some doors were closed during mapping). If you now integrate the laser scan into the global costmap, you can detect if a previously closed door is open and paths that have not been possible before are possible now.