[jerf]

But... why?

How do you win moving your central controller from a 4GHz CPU to a multi-hundred-MHz single GPU core?

If we tried this, all we'd do is isolate a couple of cores in the GPU, let them run at some gigahertz, and then equip them with the additional operations they'd need to be good at coordinating tasks... or, in other words, put a CPU in the GPU.

[layla5alive]

Surprise: there are already CPUs in the GPU - they're called things like "Command Processor" (but not only) - they're often tiny in-order ARM or RISC-V cores.