"Most dwarves have taken to it." Boran continued, turning serious as he spoke. "Can't believe we never discovered it before... Then again, no one thought it was possible to move the visualization of magic outside our minds and into the physical world."
It wasn't a difficult concept itself, but that was precisely why no one considered it. After all, when something worked, why innovate?
Everyone was taught and brought up on magic being to do with visualizing spells mentally. The same held even for Dynamic casters. Runic casting was the act of moving that process into the physical world.
Now, a similar method already existed. That was entirely what Smithing and Enhancing hinged on. To bring magic from the ether of our minds and place it into the physical world. And unlike spells, they weren't ephemeral. They stayed in the world long after creation, even after their creator died.
