But if some secret spells could spot that Hermione’s soul is displaced, there is likely other magic that could be used to divine the location more precisely.
If spell returns the actual distance instead of “is the distance greater than a fixed threshold built into the spell”, then relevant technomagic already exists under name “trilateration” (what GPS does, essentially).
dismantling Voldemort’s network would still be a megaproject
Totally within power of Harry’s generation, in my opinion, so they could take that option. “And it is not our part here to take thought only for a season, or for a few lives of Men, or for a passing age of the world. We should seek a final end of this menace, even if we do not hope to make one,” as Gandalf said at the council deciding what to do with the One Ring.
If spell returns the actual distance instead of “is the distance greater than a fixed threshold built into the spell”, then relevant technomagic already exists under name “trilateration” (what GPS does, essentially).
Totally within power of Harry’s generation, in my opinion, so they could take that option. “And it is not our part here to take thought only for a season, or for a few lives of Men, or for a passing age of the world. We should seek a final end of this menace, even if we do not hope to make one,” as Gandalf said at the council deciding what to do with the One Ring.