Doesn't work. It's not that powerful spells are known but can't be cast, the function of the Interdict somehow causes powerful wizards' notes to be unintelligible to the uninitiated.

I was thinking about it earlier and Harry has massively underranked the utility of Horcruxes. If one person must die so that a different person can live 100K+ more years then that is an incredibly desirable tradeoff from an impartial utilitarian standpoint and everyone should be doing this. You could even choose to murder only old and dying people so that there would be almost no loss of net time that people spend alive. He dismissed it way too quickly during his conversation with Dumbledore.

are not, as a rule, a different intellectual order than we are

Yes they are— in the sense that they will have decades to spend ruminating on workarounds, experimenting, consulting with others. And when they find a solution the result is potentially an easily transmitted whole class compromise that frees them all at once.

Decades of dedicated human time, teams of humans, etc. are all forms of super-humanity. If you demanded that the same man hours be spent drafting the language as would be spent under its rule, then I'd agree that there was no differential advantage, but then it would be quite a challenge to write the rule.

Unbreakable Vows are ridiculously broken, as Harry briefly observes in Ch. 74. They're even more ridiculous in fanfictions where people can just grab a wand and swear something on their life and magic and thereby create a magically binding vow. I had to nerf the hell out of their activation costs just to make the MoR-verse keep running. I can't depict a society with zero agency problems, a perfect public commitment process and an infinite trust engine unless the whole story is about that.

I wonder how long it'll be till everyone in Hogwarts realizes that the whole recent attempted-murder plot was designed by Quirrel for the sole purpose of having both Slytherin and Ravenclaw win the House Cup at the same time (because when Slytherin and Ravenclaw lose students mid-terms, the school rules are ambiguous about whether the points earned by those students should be counted towards winning the House Cup)

I'm expecting the plot to have also contained as a crucial component a Golden Snitch with a delayed-action memory charm, which will cause the Ministry to overreact by banning Golden Snitches on school grounds, thus fullfilling Harry's wish of Snitch-less Quidditch as well.

I'm only half-joking with the above.

• Failure to talk Hermione into leaving Azkaban of her own free will

Assuming you meant Hogwarts...

If there is a possession element to this plot, as Dumbledore believes, it may not have been her will she was fighting when she had to clamp her mouth shut to keep it from saying Yes.

"Squib" is a nonmagical child of magical parents, at least in canon. MoR seems to be using it as a genetic marker, which I'm honestly not sure is compatible with canon.

(Now that I think about it, if Harry's genetic theory is correct, doesn't a squib child of a wizarding couple imply that Mom was getting some on the side?)

Why do you not consider Snape to be an alternative? Yes, Quirrelmort has gained a lot by Hat's actions, but: a) Quirrel could be manipulating Snape. b) Quirrelmort probably has an extremely accurate mental model of Snape.

What is your mental model of Snape?

Re: the debt. I think Lucius may have been playing very high speed chess when he picked the amount. The point isnt to have Harry in debt to him, the point is to afford ex-deatheaters loyal to Lucius the oppertunity to trade in a blood debt to Harry for a monetary one to him. If this is so, the debts are likely to be paid off long before Harry can set any money making schemes in motion. - This would count as a downside to being in debt to Lucius - He cannot refuse cash in lieu as long as he is a debtor.

The ending note of that trial couldnt have been more precisely picked to convince people that he is a bodysnatch victim. Riddle me this? Gah. Incoming kidnapping and exorcism attempts. Not that Harry wouldnt benefit from a good exorsism.

Hermonie is going to read the note she gave him on dementors as soon as she is out of palfreys office, right? Seems nigh-inevitable. And I dont think she is nearly as commited to secrecy as Harry is, so word might well get out on how he pulled that stunt very shortly. On balance, this would tend to reduce the odds of him being murdered by a good citizen, so not all bad?

Highly unlikely: blood debts have probably been a significant political currency for a long time, and both due to institutional path-dependency and a lot of vested interests, I highly doubt that they'd change the importance of blood debts. Also: it seems like a lot of the justice system is built up around this concept. It would require a total overhaul of the justice system to deal with the blood debt. Otherwise they'd have to change the significance of being imperiuse'd which is also unlikely due to most of them otherwise being Azkaban(ne)d