But I'm Too Perceptive to Die!

Question: Why don't Charisma and Perception have resistance knacks? Charisma could work similar to Appearance since your opponent cannot bring herself to harm someone so charming/kind/innocent/whatever. Perception could allow you to notice a shift in your own behavior, notice if you are demonstrating patterns or tells consistent with supernatural persuasion, or just notice you are agreeing with someone who has a nefarious intent.

Alas, the major reason is that some attributes just don't work all that well for resists, and we didn't feel it was necessary for all of them to have them. Certainly not the physical attributes, which don't have anything to do with your brain and the meddling thereof, but we're not really interested in adding the other two, either.

For one thing, I don't think Perception is a reasonable candidate; just noticing you're doing something weird doesn't mean you're not, you know, doing it. You don't think that poor schmuck who's stabbing his brother because someone told him to with Overt Order realizes he's doing it at the time and is freaking out about it? Of course he is, but noticing something is wrong and being able to do anything about it are very different things, and sadly, Perception is an entire attribute wherein there's no equipment to do anything but notice things. When somebody uses Transform Person to turn someone with high Epic Perception into a newt, the fact that they have totally noticed they're being turned into a newt is not going to prevent them from ending up small and slimy. (I would note, though, that Perception is the resist stat for seeing through shapeshifting and Illusion, so it's definitely not out of the game as far as avoiding other peoples' shenanigans goes.)

You're correct; Charisma certainly could have a resist knack in the same vein as Appearance, but I don't think it really needs one. Charisma is already chock full of tools to prevent people from using things on a PC with a lot of it; from using Charmer to make them like you, Boys Will be Boys to defuse their wrath, Calm the Savage to take the spunk out of them or Filibuster to just shut the whole scene down, Charisma characters already have a leg up when it comes to avoiding people being magically nasty to them. A resist knack seems like overkill - in theory, having Charisma itself already kind of does that, because people of course like and/or respect you as soon as they see you, so they're already predisposed not to smite your brains with Cycle of Madness unless you piss them off. The knack works a lot better in Appearance, where players may or may not have those automatic defenses already in place (sure, a really gorgeous god might have an automatic pass in some situations, but what if they're also really unpleasant and good at pissing people off, or their Epic Appearance is all of the hideous variety?). Manipulation doesn't need a resist knack for pretty much exactly the reasons Charisma doesn't.

Appearance, Intelligence and Wits seemed like not only the best candidates for resist knacks to us because they made the most story sense, but also the best spread to give PCs a good choice of areas they might be interested in specializing in without forcing them all to head for one attribute because it's "the resist stat".