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Where there's no such bright line between yes/no, then maybe it isn't actually "disease" at work so much as some kind of spectrum. Maybe in the case of EF, it's (for the majority) a heritable developmental delay, and not a permanent impairment.

Yes, I tend to think along these lines as well. Or that it's a spectrum, like ASD. Actually, they're finding more and more ASD/ADHD overlap.