You're entitled to that opinion, however part of the magic of so many Disney dark rides is the appearance that the entire attraction takes place within that facade. When the fact that something is a facade is revealed before you see the actual facade, it takes away from that experience.
Haunted Mansion, Splash Mountain, DINOSAUR and many others intentionally hide the show building to contribute to the magic of the attraction. In a land as immersive as Pandora, having that appearance broken before you even see it, hurts the experience.