The basic idea of legibility is that the act of making something comprehensible enough to control is itself an act that shapes the thing to be controlled, often with far greater consequences than the control itself. This is because it removes complexity that is deemed as irrelevant that makes it harder to control, and that complexity may be in some way essential to the health of the system.
A woodworker works along the grain of the wood to prevent splinter. A butcher slices across to the muscle fiber to improve tenderness. A sailor trims the sail to balance the lift and drag from the wind. When we respect the material, the material pays us back in convenience, safety, and efficiency.
Good web design requires the same understanding of and respect for the materials. And that material is the browser, along with its semantic HTML, default styles, and standard behaviors. But the wide use of design software such as Figma, Sketch, and AdobeXD has trivialized the nuances of such material into “canvases” or “artboards” of pre-defined sizes. The convenient styling and manipulation of pixels and objects have disguised the hierarchy of the DOM, the constraints of the device, and the personal preferences and browser setting from real users. Dishonest tools encourage dishonest design.
In the context of web design, Dieter Rams’ principle is not only a resounding criticism against mindless trends and meaningless decorations. It is a humanist reminder to put material honesty and social responsibility above the pursuit of the “pixel perfect” design.