No one has done it because it’s a comically bad idea. It’s like trying to build taxis with only rail infrastructure. GPUs are only fast because they do the same

No one has done it because it’s a comically bad idea. It’s like trying to build taxis with only rail infrastructure. GPUs are only fast because they do the same thing across multiple pieces of data at the same time. Branching is possible but incredibly expensive. You would end up with terrible performance and poor power efficiency. And you would still need a cpu to load programs on the GPU and handle io.