I’m sure I’m guilty of doing this, but it’s mostly mental laziness. When I’m sorting stuff for donation I’m mostly thinking “keep” versus “donate.” The third category of “throw away” is there and their is a pile, but it’s not one of the two defaults, so unless I notice the article is quite bad I don’t toss it there.
This has also meant I’ve kept clothes that really should have been tossed as well…