There is an old programmer's joke about writing abstractions and expecting zero-cost.

How does that apply in this case? The whole point is that the agentic AI/AGI skips all the abstractions & writes optimized low-level code for each GPU vendor from a high-level specification. There are no abstractions other than whatever specifications GPU vendors provide for their hardware which are fed into the agentic AI/AGI to do the necessary work of creating low-level & optimized code for specific tasks.