"Benefit of the doubt" is not a neutral "I don't know". The commenter I responded to is giving the claim "this is a good decision" the benefit of the doubt, and

"Benefit of the doubt" is not a neutral "I don't know". The commenter I responded to is giving the claim "this is a good decision" the benefit of the doubt, and I'm giving the opposite claim the benefit of the doubt. Neither of us is saying we know for sure, or even with much confidence, which is the right claim, but our defaults, our "priors", are opposite.