Why is the handling fee not the highest?

Because loading and unloading is the bottleneck of the whole logistics.

Loading and unloading is a cohesive activity. Any other logistics activities are connected by loading and unloading during the transition, so loading and unloading often becomes the bottleneck of the whole logistics, so the cost of loading and unloading is not the highest.

In the same geographical area, the activity of changing the storage and support state of things is called loading and unloading, and the activity of changing the spatial position of things is called handling, both of which are called loading and unloading.