I mostly agree with you. Except when it comes to books. Some books one uses for reference. Some are pretty objects in their own right so you'd hang on to them as one would a painting (apologies for mixing pronouns). But also there's tsundoku[0] – acquiring more books than one can/will read, a disease I'm afflicted by. The article even mentions Marie Kondo :)
Umberto Eco would agree with your penchant: "Eco's library contained 30,000 books and tended to separate visitors into two categories: 'those who react with 'Wow! Signore professore dottore Eco, what a library you have! How many of these books have you read?' and the others — a very small minority — who get the point that a private library is not an ego-boosting appendage but a research tool. Read books are far less valuable than unread ones." [0]
[0] http://www.huffingtonpost.com/entry/theres-a-japanese-word-f...