The GPU and CPU have fundamentally different jobs. Anything that needs to be displayed on the screen requires processing by the GPU. The CPU cannot to that. While there are games that primarily use the CPU, they still need to use the GPU. Even just browsing the internet or the files on your computer requires a GPU.
The GPU is really good at vector mathematics, which is why it’s good at interpreting the 3D environment of the game and telling the screen what color to make what pixel. The CPU can’t do that, the CPU does basic math, like addition, multiplication, and logic. While you technically could get a GPU do those tasks, there’s so much power you aren’t utilizing if you treat it like a CPU, so it’s cheaper to have a CPU for all the normal math, and a GPU for all of the complex math.
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