I agree with you that a “mapping” tool is needed. When we started with Fibery, we used the Project Management template and then, a year later when we had more knowledge of Fibery, decided to re-build it from scratch taking in account our needs. One of the obstacles the team is facing is the inability to easily convert an entity (and its sub-entities at the same time) into a new structure. If you have a Project with 10 Tasks and 20 Subtasks, you need to convert one by one everything and it takes time.
So, having a manner to map the fields and the ability to convert everything linked to the converted entity would be a big step forward.