This leaves the more concrete questions: the answer you got on inquiring sounds as close as you are going to get to: yeah you're right, we've got no business saying its required but we're going to push it as long as we can get away from it.
And the NPS question. SEKI gives the impression that the Whitney Zone extends down to the Crabtree station, and that wagbags/pack-out are required from there on. OF course they also give the impression that bear boxes are required on the HST, which I know is wrong. Makes you wonder if Inyo really has a rule there, too.
In any event, SEKI issues bags with HST permits, and says at the time (and I think on the permit with Whitney exit)that they are required past Crabtree. Not so?
Are they just cooperating with Inyo or did SEKI/NPS actually issue a rule?