I square EFGH with side length 2, the diagonal EG/FH is 2.82...
And if you measure the diagonal of square ABCD, it is NOT one.
Reason states that diagonals must be greater than side lengths.
???

None.

NudeRaider -- blessed innocent soul knows nothing of the strife we had before EUDs were discovered 
DarkenedFantasies -- Probably just didn't care. For example, at some point before release, they've updated the graphics of some of the Protoss buildings (Forge, CyberCore, Citadel, Observatory, Arbiter Tribunal), but instead of properly re-rendering them with edited 3D models, they did crappy copy-paste jobs on the rendered graphics.
Symmetry