We’ve been asking for at minimum tags to help us with roll-up reporting since day one of using the platform (over 5 years). Tags would be able to assist when attributing a piece of collateral, event, etc. to multiple campaigns/themes/topics. Previously when managing campaigns from the SFDC side we did leverage a parent/child heirarchy. Tags should be able to be used across all assets of the marketing platforms (forms, emails, landing pages, etc.)