o1 (and likely sonnet 3.5) made chain of through and other complex prompt engineering irrelevant.
Realtime API (and others that will soon follow) will made the best VTT > LLM > TTV irrelevant.
VLMs will likely make LLMs irrelevant. Who knows what Google has planned for Gemini 2.
The point is building these complex agents has been proven a waste of time over and over again until, at least until we see a plateau in models. It's much easier to swap in a single API call and modify one or two prompts than to rework a convoluted agentic approach. Especially when it's very clear that the same prompts can't be reused reliably between different models.