What is cheaper is entirely dependent on the specifics of what is being compared. The world’s most expensive theme park attraction, Guardians of the Galaxy: Cosmic Rewind, sits inside a large, unadorned warehouse. The world’s most expensive theme park, Epic Universe, has more outdoor attractions than indoor ones. It’s not a simple yes or no and there’s a reason shade is still brought up as a criticism of various projects isn’t because designers live somewhere else but the high cost of indoor, air conditioned space.