The problem here is the conflation of "macro" with "strategy". If the parent comment had defined the terms properly, there'd be less disagreement here. They rightly define micromanagement as the control and use of small numbers of units, whereas macromanagement refers to the management of the non-fighting, production related activities like producing workers constantly until saturated, producing supply depots on time, producing units constantly from the correct number of facilities, and so forth. Strategy itself refers to a broad game plan which may incorporate unit composition, large-scale plans for army movements, plans to limit the economy of the opponent, and so on.

Thus, strategy is the widest tent, and someone like sOs shows the truly massive number of strategies that can be employed. In contrast, macromanagement does indeed have a smaller decision space, since really the "decision" with macro is pre-defined. Make your economy and production as efficient as possible. There may be slight variations in how its done, especially in Brood War where the economics are much more nuanced than SC2. Nevertheless, if you watch a variety of pros macro out mass marine-marauder-medivac, they will usually have very very similar expansion timings, identical numbers of barracks, and any changes in the timings/build orders is strategic, not macro-related. There may be "on the fly" macro adjustments due to harassment damage, however strategy is far far more fluid of a category than macro.

When it comes to micro and decision space, however, I believe that it is mostly a matter of execution and not decision. We've seen perfect blink micro stalkers, dragoon AI bots, and I think it'd be far easier to take down top players in a 1v1 micro fight since computers are not limited by mouse accuracy, emotional concerns, stress, fatigue, and a number of other factors which affect your hands' abilities. In contrast, a top player should have a much better edge over a computer in strategic realms, since strategies must be tailored to the expected opponent's strategy and mind games heavily factor into this equation.

God, what a beautiful game.