Those are different uses of APM than what the parent is talking about. The unit selection cap is kind of a similar thing, but in practice, selecting an entire g

Those are different uses of APM than what the parent is talking about. The unit selection cap is kind of a similar thing, but in practice, selecting an entire giant army and attacking with them all toward the same target at once is not competitive. So even without the unit selection cap, to win battles at high levels (even platinum and definetely diamond when I was playing) requires controlling small groups of different units in the right way. It does seem like you can get away with lower average APM for macro, but peak APM during key battles may have more of an impact. But I didn't play enough SC1 to really compare, I just mean that it is at least plausible based on my experience with SC2.