[yannyu]

There's no such thing as perfect scouting: at all levels of the game there are points where you have no idea what's coming except by reading your opponent and the metagame. For example, expecting a 6 pool or early all-in after your opponent has just taken a game in a 5 game series. Or, figuring out it's a banshee rush based on nothing but a blocked ramp.

So no, Starcraft is not perfect knowledge; much like poker you do a lot of reasoning and what amount to Expected Value (EV) calculations to figure out what your opponent is most likely to do. To gain information about what your opponent is doing in the game requires expending in-game resources, which is pretty much the exact opposite of perfect knowledge.