How StarCraft 2 is really won
StarCraft 2 rewards the player who can execute a plan while continuously checking whether the plan still fits the information available. Worker production, supply, tech, unit production, and army control compete for attention. The answer is not raw speed alone. Strong players build reliable macro cycles so scouting and tactical decisions have space to happen, then change only the part of the build that new information makes unsafe.
Competition and the broadcast
Professional StarCraft uses one-versus-one series with map pools, vetoes, race matchups, and tournament-specific qualification. Patch and map context can materially shift opening choices. When watching, compare what each player knows with what is actually happening. A safe-looking expansion or attack becomes impressive when you see the scouting signal that justified it.