The people who excel at Starcraft don't do it because they follow explicit systems. They do it mostly by practice (duh) and by listening to the advice of people like Day[9].

That doesn't mean that they aren't following implicit systems which people who don't excel at Starcraft are not necessarily following (even if systems are necessary to excel at Starcraft, people who fail to excel will of course not necessarily do so out of failure to follow the systems.)