Humans constantly scan their environment to build a mental model of what's around them. And the harder a scene is to parse, the less energy you have left for conscious thoughts. A cluttered room is literally exhausting.
As food got cheaper (or we got richer; they're indistinguishable) eating too much started to be a bigger danger than eating too little. We've now reached that point with stuff.
If you don't have any immediate use for stuff you probably never will.