O Fog of war, how you work? How can I NOT see that blinking Nexus at the end of the hill? A colossus is so high it can be shot by airships and that Commander Center which is a oversized flying building RIGHT AHEAD and yet I am unable to detect it until it's basically dropping over my head.

And than we have units like Archons which are big balls of light...

Perhaps the Fog of War *is* real, a sight-blocking mist which affect our senses (and machinery sensors!) and makes us unable to see anything beyond spitting distance.

Fun Fact: In Starcraft 1, Siege Tanks range was bigger than their sight.