Final Question on FAIR

I'd hoped to not have to say anything else on FAIR, but I've decided to ask one final question. If I can't get a straight answer to this question I'm giving up on the discussion. So, here it is.

In Thoughts on FAIR I walked through the section Analyzing a Simple Scenario. Steps 3, 4, 5, 8, and 9 [Estimate the probable Threat Event Frequency (TEF), Estimate the Threat Capability (TCap), Estimate Control strength (CS), Estimate worst-case loss, and Estimate probable loss, respectively] each require the user to "Estimate."

Do these Estimates matter to the output of the model?

If the answer is yes, then those answers are important and should be grounded in reality -- not opinions. If FAIR proponents agree with this, then we have been debating for days for no real reason. That would make me happy.

If the answer is no, then what is so magical about FAIR that garbage in does not produce garbage out?