Okay, so maybe Robin Laws should have named his book, Robin's Laws of the One True Way of Game-Mastering, because the book is chock full of ideas what works and what doesn't. Can no one be wrong?
Is AllTrueWayism any better than OneTureWayism?
The difference being here, of course, that at no point does Robin Laws ever, EVER state that there is ((virtually)) zero chance of a DM who doesn't follow his advice being a good DM. He never states that his advice is the only fount of knowledge and that if you do something that differs from what he's saying that you are a weak DM or a "not as good as you could be" DM.
He does say, "Here is what works for me. I think these are good ideas that will help your game." I don't recall him making any judgements about other people's tables that RC is so obviously doing here.
Anyway, back on topic.
To me, there is no real difference between mechanically supported fudging (like Action or Fate points) and ad hoc fudging. In both cases, you are altering die rolls. Now, as far as the honesty issue goes, well, again to me, it comes down to a trust issue.
If you trust your DM and know that he has a good grip on the game, why should it bother you if he shaves a roll or two? Why does it have to be done in front of you? Either way, the dice are going to be changed. Why break suspension of disbelief if you don't have to?
Again, to me, the "Fudge Pool" that Raven Crowking advertises, only needs about one or two chips in it per campaign. That's how often I feel that a DM might need to fudge. If it's to the point where you're fudging every session, that's much more indicative of a larger problem since the whole point of fudging is to smooth out some of the rougher edges that can come with random generation.
IOW, if those rough patches are occuring every session, then there's some serious problems in the group. However, OTOH, if it happens once in a blue moon, then I really don't see the need for a structured mechanic.