Where did you get your 90% for ML stat from? I suspect you just made it up becuase it just happens to fit what you experience personally.
I work with software for virtual studios. It's very similar to gaming in a lot of ways (even using Unreal Engine) and we really push GPUs to the limits. I'd still count this in the "for gaming" category as we;re still rendering 3D scene within a strict time limit.