Upload packages to Distribution Point
Sometimes the admin isn't local to the Primary site. This can make creating and uploading packages a painful process. Allow an admin to upload that shiny new WIM package to a local DP and have the DP be capable of pushing back to the "hub" that is the Primary Site. This will allow much faster uploading from the admin perspective (content available immediately locally even if not for hours at other locations).
This one may be a pipedream ... but it's one of the last hurdles to never installing another Primary if you're sub 100k devices.