Game Idea: Why UI ?

Seriously. UI is a chunk that was developed in deep 70th like the only way to display information about surrounded worlds. But now we have 2014, millions of polygons, complicated light models and computation shaders but still same UI. We can simply display information directly inside game on the Hero, directly inside scene, so why to waste so much money on UI. I like the guys from Skyrim did it - just minimum. And all this games with tons of UI and bad gameplay looks so cheap.