For many guests, "the attraction" of a theme park is the themed environments as much as the time spent in the rides, if not more.
There are other creative ways they can hide show buildings. On Guardians and Tron, both futuristic themes, knowing they needed massive boxes to put the coasters inside, they could have come up with a futuristic way to use architectural materials to wrap a box. They could probably get inspired at Futuroscope (and rekindle the ambition and creativity they had when they built Epcot, essentially):
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I would rather them spend money on themed architectural environments that I can spend many hours in than half a billion dollars on a thrill ride I spend three minutes on, after waiting three hours --
if they have to choose.