Every decision is a guess to some degree is it not? It is impossible to ever have complete information prior to making a decision, and even then, you are guessing how to interpret that information.
Next you're gonna tell me that the sun rises in the East. I have run a few companies, and with a little luck, have done modestly well. You never, ever, have enough information, but, at some point, somebody has to make a decision, knowing full well that all the Monday Morning Quarterbacks will criticize that decision and engage in asymptotic could'a, would'a, should'a. It's easy to be an expert as long as you are not the one who has to make the decisions.