ok.
This should probably be addressed some way. I suspect that site owners would like a convenient way to manage content at every level in the site hierarchy.
It seems very helpful to use ETP to manage content associated with an acs-subsite related content folder.
Maybe there is a better way to do this. Should ETP then create a content folder and assign the acs-subsite package_id to it? Or perhaps there is another way. I could not see how CMS addressed this, but i suspect they had thought of something. I'll take another look.