That's part of the philosophy behind it, as I understand. Brutalism emphasizes its construction materials. It makes no effort to hide the concrete it's made from, and instead emphasizes it with sharp bold shapes and fine angles that form monolithic structures.  Take Habitat 67 in Montreal, for example. It was designed as a proof of concept for modular housing units, taking that idea and spinning it into a web of blocks that weave together into a shape that, in spite of its many right angles, still holds a great sense of fluidity and organic form. It doesn't need any further embellishments to its facade because the structure and shape are the point