It's not all hoarding - some people just can't let go of their "precious" stuff.
The Economics of Tidying Up: An Economist Reads Marie Kondo. “People are wrong when they think that pair of jeans will ever fit again, Kondo is arguing. Optimistic predictions keep people from getting rid of things they don’t need.”
We adhere to the two-year rule except for jewelry, art, firearms, and heirlooms.