haha, this sounds like a piece of advice straight out of Starcraft 2. If you're anywhere but in the top 10% of ladder or above, you'll win more games and get better faster by just focusing on building more stuff than your opponent.
Unit composition, racial balance, specific attack/scouting timings, etc. profoundly don't matter if you can't scrape together a hundred food army and an expansion 10-15 mins into a game. If you can, you can start strategerizing.
