Marie Kondo's book The Life-Changing Magic of Tidying Up didn't go gangbusters for no reason. People are drowning in their stuff, and it's having a major impact on their lives.
From a feng shui perspective, it's obvious why decluttering is picking up so much buzz. The practice believes that symbolism is the name of the game and our homes represent our lives. One of my colleagues, Carol Olmstead, teaches that our homes are, in essence, "3-D vision boards." Therefore, every item that you own plays a role in crafting your life.