I'm guessing you over thought my misplaced sense of humor.I probably reacted to this definition, a characterization really, about 'guessing'.
Inherently, planning IS guessing. It's reasoned and risk estimated guessing. But it is an unjustified derogatory statement to characterize that as guessing.
By the same token, stating you will get up tomorrow at 5am, that is also -guessing-. It is misleading to quantify it that way.