Exactly. Except that it is not the Catechism which is the guide. In fact no one seems to be quite sure what is the guide, which in effect makes their leeway even wider than the grand canyon. There was the old GIRM which is being replaced by a new GIRM. But neither one really specifies the "fundamental norms" outside of which the adaptations required of the bishops are not supposed to stray.
Wow.
Makes me feel all the more blessed and grateful to finally have a new bishop here in the Phoenix Diocese, who will soon allow the Tridentine Mass to be said in some of our parishes.
Any and all are welcome to visit here for some spiritual refreshment!
Blessings to you, Max ;)