I believe that Disney chose to hide this building, rather than theme is so as not to take the view away from Spaceship Earth.
They had three choices, once they decided to construct this monstrosity:
Heavily theme it Guardians style.
Generically cover it with a stainless, mirrored, glass etc. modern looking façade.
Attempt to draw less attention to it.
I'm glad they didn't go with the first one.
I believe they didn't go with the second one for part of the reason they didn't go with the first - too much completion for the worse - with Spaceship Earth.
So we got the third.
I still wonder if they will attempt some plantings in front of it.