Design predetermines how we think, how we feel, and how we interact with the world.
From fashion, to the devices we own (Android or iPhone), to the design of our websites, we're instantly judged and judegemental of others by the widgets and aesthetics of their choice. But just as quickly design dictates presumptions it also makes them disappear.
“It’s all about content, people. Design is what holds it together.” – Designer, Mike Monteiro
To echo Dr. King, all that matters in anything (people, websites, etc) is the content and the utility. How does our or anything's existence benefit others? Once we understand the person or thing, design is less important.
Yet, everything is design. The crosswalk is designed to allow people to walk without getting hit. The desk and chair are designed to help people work. Sometimes design doesn't work. Crowds clutter the crosswalk. Kids are constricted to a sitting when they focus more effectively at standing desks. One design doesn't fit all. Additionally, over-design the basic requirements and people end up doing more harm than good to themselves.
Design matters. And succeeds when it doesn't get in the way.