Say I have a custom collection of 56 Christmas movies. During the Holiday Season, I would like to show this on the main page as a Library. Now, I could make a drive folder called "Christmas" and put these movies in that folder. However, now we're getting away from using metadata for organization and moving back to using folders for organization. Something you've spent the last few years trying to get away from.   So each collection should have a toggle to show it as a library on the Home Page.