Looks like both the old and the new omit the "fallacy fallacy" which is to assume someone's conclusion is false, simply because their argument on why it's true was fallacious.
I know the conclusion isn't necessarily false, but I also have no reason for assuming it to be true - since there is no good argument to support it.
Though I think it is even better to weigh how much of the argument rests on the fallacious premise (or step) and then evaluate the argument sans fallacy.