Ehhh... no... the conclusion about not being able to draw conclusions from the absence of two absolutely identical armies is incorrect. There's nothing to guess here; after all my hundred and a half battles against humans, I've understood one unpleasant, and sometimes pleasant, thing. "Strength" isn't in the army; "strength" is in the mind. And in the beginning, and even in the last half-year, I sometimes won solely due to experience. Often, playing against a newbie online – but he's been playing HotS for 8 years!!! – goes in a relaxed mode because I think, "I'll win anyway," with mastery, as they say. But then comes the day of the finals, and oh my God! He's actually quite good. He assembles an army 2 or even 5 times larger! But knowing some of the hidden aspects of the arena allows me to easily dismantle a pile of meat scattered across the field with my – at first glance – small units. I agree that there are no two identical armies. But there isn't also the fact that one is necessarily weaker than the other. There are two people, one smarter or more resourceful than the other... or, at worst, luckier. :)
And the arrangement helps to reveal which of the two players is more level-headed.
P.S. By the way, we decided to only write about the good things in this topic :D