I actually wrote a really long post a day ago in this thread explaining how the Fantasyland show buildings are part of their rides' design conceit. But even still, Disney went to the trouble of obscuring the large, uninteresting walls those buildings sometimes created because they knew the area would be improved by it.
As I've said about 6,000 times, and as others have echoed, the TRON showbuilding should either be themed OR hidden. If the people on Disney's payroll truly can't come up with any way to justify the Big-Box-Store show building that fits within the theme of the ride, then they should either hide it from guest's view, design a different ride that doesn't require a big, "unthemeable" box, or consider other employment. This isn't an impossible assignment. And for a $300+ Million Dollar ride it shouldn't even be a challenging one.
There are so many potential options here to keep a building like this from towering over the Magic Kingdom, and they chose none of them.