Marie Kondo's main criterion for keeping stuff is whether it makes you happy to have it. "Does this spark joy?" It has nothing to do with the utility of the items in question.
Interesting digression: In Japan there was a recent fad of cleaning toilets with bare hands. A sort of hyper-stoic discipline exercise. It's not as big as western media makes it out to be, the story mainly revolved around a volunteer group that cleans public toilets with their hands.
And, surprise, she discusses this exact retort to a simplistic summary of her method in the book.
It's fascinating how many people in this thread have never read anything she wrote, take a pithy sentence some other non-reader put forward as an accurate representation of what she stands for, and then "rebuts" her with the most glaringly obvious counter-example.
