The strongman for it would be:
Our current computing paradigm is built on APIs stacked on APIs.
Those APIs exist to standardize communication between entities.
LLMs are pretty good at communicating between entities.
Why not replace APIs with some form of LLM?
The rebuttal would be around determinism and maintainability, but I don't think the strongman argument is weak enough to dismiss out of hand. Granted: these would likely be highly-tuned, more deterministic specialized LLMs.