Emmanuelle, just to make sure, my comments were directed in the direction or Telefonica, not you. To my knowledge none of your commits has done anything and I do have the slight suspicion that commits to 5.3 have not been properly rolled back after the decision to commit the changes to HEAD, but I did not want to revert that either.
In my opinion chat should not be dependent on .LRN. If it becomes per design, please make sure to fork it and give it a special name, as I love the package but do not have .LRN installed all the time.