- professional SC2 games are definitely longer than 6 minutes.

- not all strategy is action oriented, scouting early to discover your opponents strategy is a thing, for example

- in professional SC2 it's also about the meta-game. It's a game of bluffs and predictions. If a strategy doesn't work out both opponents have to decide if they're going to change or not in the next game in the series. Sometimes your strategy failed because the other player used the counter-strategy. But if they keep the same strategy and you use THEIR counter-strategy, you'll win the next one.

That last point is much larger than you might expect. It's a bit like poker.