'Collections should keep track of their views' seems badly explained. You're not keeping references to views on a collection, you're keeping a reference to subviews inside a view that uses a collection. The code is correct, and agnostic to whether the collection is local to the view, or a shared collection.
Actually I goofed up while typing out the post a bit. Views that contain subviews should keep a track of the sub-views. Not collections. I have updated the post. Sorry for the confusion
