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I actually think you are right. Most examples do fall under Genius Ditz since the characters don't have a mental disorder.
Although, doesn't Genius Ditz means mean the same things as Idiot Savant, but without the mental handicap? For example, I am more than certain that Luffy and Zoro from One Piece falls under Genius Ditz (they're both listed under Idiot Savant, incorrectly I feel) but I am almost certain that L from Death Note is not a Genius Ditz. He's listed under Idiot Savant for some reason.
I think we need to put a note on that trope that just being socially awkward, Book Dumb, or even slow doesn't mean that character is an Idiot Savant because they're really good at something.

Hello,
I have a question about Idiot Savant. I could be misreading, but there seemed to be a lot of bad examples on the page.
Correct me if I am wrong, but doesn't Idiot Savant means someone who is dumb or incompetent in all areas except one because of a mental disorder? I am asking because most characters listed on the page are not mentally disable or stupid, but are Book Dumb, naive, Raised by Wolves, or have a passion for just one thing in life and are extremely good at it. They maybe awkward in most situations because of these factors, but they can function well on their own, give good advice, or state the simple solution. An Idiot Savant is someone who can't take care of themselves because they are literally only good at one thing and one thing only, think Rain Man. So, even someone like Forrest Grump wouldn't fall under Idiot Savant, despite being mentally handicap, since he does have many skills, can function on his own, and take care of himself.
But I want to make sure that I am understanding this trope correctly so I can erase any abuses on the page.