We are seeing a lot of information about Quests being implemented in Title Data, but we designed our interface for Quests, Events and Object collection items in a similar fashion. We we use the Catalog V2 Item - with a file we provide with JSON to parse on the front-end for actions and linking our rewards to other Items (Types - QuestItem, Currency, Booster, etc). Objectives for some types of our activities (it's not a complex mission system). We have a thumbnail representaton of the Quest for the UI display that is stored in the Images. We also are using a 3D map display in which we have the 3D object icon marker also stored in Files section. We can then give our player into their inventory 1 instance of that quest and we maintain in player data the Completed Quest.
Would this be an issue, what we like is how we can add quests and new item rewards pretty simply in the Game Manager Catalog. The big benefit is I can add new 3D objects, Icon thumnail and other digital assets for the Quest and it's display inside the Item and all managed in PlayFab