As for 2, I see nothing in FKR that requires a GM to conduct a post-mortem where they need reveal reasonings. In fact, the references and posts about "invisible rulebooks" directly cuts against this. The same goes for 3 -- there's nothing to indicate this as even prevalent, and posts have been made that undercut it -- again, 'invisible rulebooks" does work here.
What do reasons have to do with rules? (Original) FK emerged because the rulebooks were getting in the way of realistic/good/sensible action resolution.