Since your example has to do with AC:NL cluttering, and not so much irl cluttering, I would've posted this in the AC:NL section since you would've gotten more replies and less negativity towards it.
Maybe show how in-game hoarding and clutter can be a sign of how you hoard and are cluttered irl? Or something on the lines, since game related stuff usually doesn't belong here.
I don't know if I agree with KonMari's method or not.
I personally (mostly) use the decluttering method of this: If you haven't used the item in a year, you probably don't need it. Now, obviously, I don't apply this to 100% of things. For example, I haven't used my toilet plunger in literally a few years since the places I've lived in more recently had better toilets. But a plunger is one of those things where if you need it, you REALLY need it. So it can stay around. But for the most part, this is something very true. I used to have a LARGE book collection, and most of the time those books were just being an annoyance whenever I moved (very heavy!). They mostly just sat on the shelf being dusty. So I got rid of most of them.
That doesn't really work for a video game though. For New Leaf, here's the philosophy I use: I get rid of all re-orderables that I'm not using. If I need it again, I can just order it. No big deal. For non-re-orderables, I get rid of the ones I don't actually care for and probably won't use. If I really want it again, I can probably get it through trades or by myself in the game.
I have a friend that's using her method & it's really helping her clean up her life. She feels more peaceful at home & I think this method has reduced her stress. I don't know much about it because I didn't read the book & I'm not planning to but I did start folding my clothes using her method & it's so much cleaner & a lot easier to find things.
That is an interesting way to do it. I personally think that if you haven't used it in a long while, you should probably get rid of it.
I'm not a hoarder so i don't know much about this stuff but i wish anyone with a hoarding problem good luck.