For the "Category" Dimension filter on the "Lifecycles" report, it doesn't really make sense to pull this data from "Collections". I don't know about other retailers who are on Shopify, but we constantly create new collections and delete ones as we create new events for promotions or other marketing events. Also, the reporting is also a little inaccurate, because it lists collections that are not even published as the top "Categories". We use an unpublished collection for tax purposes (it's a Shopify convention), so I understand how this might trigger an event. However, this report is a little misleading. I think reports should serve users and not the report itself - so I think this is just unnecessary if I can't even use it to gain any insight.