It’s the largest box you’ll ever see for an indoor cutting edge roller coaster. No one is walking through it like a pavilion, but they already have the Energy building that’s upgraded for the attraction. Form follows function. Why would it be any less? In the future, the reality should should not have ruin it for you. Amazing that a building will break the reality that it’s something quite amazing in a building.
The reality was that you were in a place of innovative design and intention. Clearly that's not the case anymore, but they certainly don't seem to have a better idea in mind. Or if they do, this new building does not demonstrate it.
“Form follows function—that has been misunderstood. Form and function should be one, joined in a spiritual union.” – Frank Lloyd Wright
A bird's wing is not so shaped because it looks cool, it is so shaped to achieve flight and is beautiful as a result of this harmony of shape and service.
The modernist argument in architecture was that a building should be designed to suit its purpose, not the other way around. Often this is taken to suggest that buildings be designed without ornament, but this doesn't really bear out - Louis Sullivan's most famous works all feature stunning ornament in cast iron while still speaking to this mantra. The argument was against
excessive ornament.
The building in Future World whose architecture most suits characterization as having excessive ornament would be Mission: Space, because its planets are a facade on a squared warehouse, not truly related to the building's form, but even then they get a pass because they do enough to tell you about the experience inside and then don't push further in detail. Excessive still isn't the word.
Each early Future World Pavilion was a stunning example of "Form Ever Follows Function" -- the buildings didn't just house rides and showplaces, they spoke to the nature of the pavilion's subject, drawing you in and suggesting what could be found inside through innovative, custom-tailored designs without excessive ornament.
The Guardians building is by NO means an example of form following function -- unless we want to concede that the sole function of it is to put a roof over the Roller Coaster inside, because the building does not suggest any sort of spiritual union with the experience inside. If that's the case then it's demonstrably clear how this building has no business being in Future World no matter what's inside, be it Guardians or even something more thematically appropriate, because a building like this does not follow the form of what's inside, the way the entire rest of Future World does. If you didn't know what the building was for its design wouldn't give you any clues.