Well, I want to be able to delete all the import folders that Photos creates when I import files from SD cards. Deleting 10-20K photos with the select/swipe/delete method is the pits. If I'm at home, I can plug the thing into my Win desktop and deleted the contents of each import folder (but not the folders themselves). It's tedious, but not nearly as tedious as deleting on the iPad itself.
Looks like the file manager thing is not all it's cracked up to be, at least not for me.