I'm not convinced. Each level is a different game, and being aware of that let's you choose the right tool for the task at hand. Being aware that rushing an opponent asap is the best way to get a head start which generally converts into a win is something you can expect to use at all the levels. It's hard to perform on deity, but if you manage it you're well on the way. IMHO the game should be fun to play. There is no point in rotting the fun away by learning "recipe play" that is viable on all levels.