It would simply be guesswork, not bravery, and such 'forecasts' would have little or no value.

Far from it. What do you learn from predicting a near certainty? A high percentage of accuracy. What if you test your theories when certainty is unclear? A high percentage of inaccuracy. But if you analyse your predictions and learn from that, then you you have a better chance of being able to predict with a greater certainty in the future.
I'm thankful that you and Dawlish are not scientists, or we'd still be in the dark ages.