Usage of the "Media" EntityProvider plugin

Hi,

As working on MediaContextualCrop collection, i'll try to integrate my developpement as best as I can.
So I wonder understood what the correct usage of the "media" EntityProvider Plugin ?

It seems that focal_point or Image_widget_crop use de facto the "file" entity type provider.

There is a "real" use case / possible usage of the "media" EntityProvider ? or not ?

Thanks