[Theoretical] Sending Jobs to the GPU

Considering how strict Burst Jobs are, can't they be reasonably easily converted into compute shader code?
Why exactly this is not possible/preferable? Is it because of the BUS lag?
What about the onboard GPUs some processors have? Couldn't that be used without having to go through the BUS?
I get that there is probably no currently implemented CPU driver that lets you send stuff to the onboard GPU, but shouldn't it be possible? Shouldn't CPU manufacturers explore this?

 

I think somewhere in forum it was mentioned that Unity has plans about GPU support for jobs. And the goal is to be able to switch between GPU and CPU with an attribute or something. I could be wrong though. It was a long time ago when I saw that.

 

https://forum.unity.com/threads/hybrid-renderer-v2-0-4-0.847546/#post-5605660

 

More appropriate link of discussion: https://forum.unity.com/threads/srp-surface-shaders.847999/#post-5608600

 

Burst jobs writing straight to GPU memory and C# shaders would probably accomplish jobs on the GPU.
Nice to know it will actually happen Soon™