Don’t read too much into the DSM definitions. There’s an (often explicit) caveat that they apply iff the condition distresses the patient or seriously affects their life.

It’s healthy to hang onto a few ratty t-shirts because you might need them to mow the lawn or because they remind you of good times; you can even be a bit bummed when you eventually do throw them out. It’s compulsive hoarding when you do it even though it seriously bothers you or turns your place into a death trap.