I've seen news articles on research that consider hoarding an addiction, & it is internationally recognised as a disorder
university course - Understanding and Treating Hoarding Disorder & Mayo clinic

we have a well-known family of psychologically affected hoarders in a suburb not far from me - Bobolas family hoarders in the thick of it as big clean-up begins at Bondi

My 1-bedroom apartment is full of books, craft materials, collections & lots of other useful stuff, & some of my non-collecting/tidy freak friends consider it a mess (so do I as I look at the books etc. on the floor that have slid from their neat piles ...

But when does accumulating slide over into hoarding disorder?

sandra