I interpreted their failure to do such a thing not as being illogical—they did have Lily, after all—but as part of a downside to the spell. As in, yes, the Secret Keeper being in the hidden area would destabilize the spell given enough time. It couldn’t be too little of time, or Dumbledore wouldn’t risk coming in, but as I recall he just popped in and out. This is what I mean, when I say that it’s not perfect—a perfect hiding spell would have allowed the weakness to be hidden inside with it.
That kind of limitation actually makes sense from an in-universe stance. When you designate a Secret-Keeper, you are entrusting someone with your life and safety—deliberately placing your lives in the hands of another. How much trust does it take, to ask someone to protect themselves? At least to me, it seems to match up fairly well with the kinds of sacrifices required for the Unbreakable Vow. The reasoning for why it doesn’t work for other Secrets is shakier, but it could be along the same vein, or perhaps the charms can’t really tell the difference between Keepers. Hrm.
That...is an interesting possibility. I read a fanfic which had them work like that, except that they started to destabilize after a while, a slow process that made them still very difficult to discover decades later. Kinda makes you wonder anew why Voldemort didn’t stash one or two of the horcruxes behind a fidelius and then kill everyone else involved, but eh.
I interpreted their failure to do such a thing not as being illogical—they did have Lily, after all—but as part of a downside to the spell. As in, yes, the Secret Keeper being in the hidden area would destabilize the spell given enough time. It couldn’t be too little of time, or Dumbledore wouldn’t risk coming in, but as I recall he just popped in and out. This is what I mean, when I say that it’s not perfect—a perfect hiding spell would have allowed the weakness to be hidden inside with it.
That kind of limitation actually makes sense from an in-universe stance. When you designate a Secret-Keeper, you are entrusting someone with your life and safety—deliberately placing your lives in the hands of another. How much trust does it take, to ask someone to protect themselves? At least to me, it seems to match up fairly well with the kinds of sacrifices required for the Unbreakable Vow. The reasoning for why it doesn’t work for other Secrets is shakier, but it could be along the same vein, or perhaps the charms can’t really tell the difference between Keepers. Hrm.
That...is an interesting possibility. I read a fanfic which had them work like that, except that they started to destabilize after a while, a slow process that made them still very difficult to discover decades later. Kinda makes you wonder anew why Voldemort didn’t stash one or two of the horcruxes behind a fidelius and then kill everyone else involved, but eh.