Very interesting approach Laurent. I see one challenge with all of the team members being able to relate to the material, and thereby understanding the analogies presented, although you state that team members unfamiliar with Lord of the Rings were also on board.
Also, such a framework requires some upfront investment of time and effort to build out the model. Not something that a team can just jump right into during a retrospective.
I'm interested in pursuing this with one of my teams in the future, but drawing analogies to Game of Thrones instead of LOTR. Thank you for the inspiration.