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I want a concise definition, what feature makes it so? If I can't tell what is and what isn't a thingy the whole article is pointless.

Ironically, that's exactly what the article is about- In MD users can't tell what isn't nor isn't a thingy.

Anyway, it's like crystal meth. If you don't know what it is you are winning! The advice is for people who are unlucky enough to be near it.