Now that I've identified what I want to say...
The theater should be an experience, more so than the cinema. Going to a show should draw me directly into the world it is trying to portray. This is the major reason why the filmed
Phantom of the Opera will never be as good as the staged show (that and the fact that they took out the flaming skulls--who takes out FLAMING SKULLS?). The movie just doesn't have as much capability to draw me into the world, to make me feel as if I myself am in danger when the chandelier comes crashing down.
The Lord of the Rings musical doesn't need to be painstakingly faithful to the book. There isn't time. However, it has to feel like Middle-Earth. Otherwise, it won't work.