It's a central tenant of minimalism and seems to be embraced by many millennials.
You can just as easily say an uncluttered mind is an empty mind.
5. A cluttered room can contain many things; furniture, books, technology, knick knacks, photos, art work, print media, garbage, litter, tools, and windows to name a few.
7. One could make the argument that simple clean uncluttered environments produce simple thoughts not complex thoughts.
10. Without that clutter it's much harder to form new thoughts, new ideas, experience new emotions etc
12. To get rid of bad clutter and promote the good clutter we do this thing called cleaning. We don't throw the baby out with the bathwater when we clean him.