The thing is, even though Voldemort/Harry level competence is absurdly rare, Moody level competence is significantly more common.
And yes, the Fidelius is supposed to be the highest-end absolutely-perfect conceptual defense against being found.
As far as finding the general location... it's nontrivial, but it's a whole lot easier. Tail known Order members and track where they go; if you see a vague density start tossing balls around. Or, if you're clever/powerful, come up with a city-wide version and then go in order of population.
Sorry, I wasn't clear. Yes, it's referred to as the best they have. But who says it's actually perfect?
If anyone actually said it, they're wrong. If it was perfect, then Lily or James could have been Secret Keeper. Or even Frank/Alice for the Potters and Lily/James for the Longbottoms.
Moody said that the werewolf that he trusts slightly more than usual figured that most Aurors died 8.5 times before 'lucky' became 'prepared.' Assuming he wasn't lying. That doesn't indicate a higher level of competency that many people achieve. Though once you start looking...
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 96. The previous thread is at almost 300 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system.
Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, .
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: