Programmatic and multi-step use cases. If you need chain-of-thought or similar, tool use, etc. Generating data.

Most use cases outside of classic chat.

For example, I made an on-demand educational video project, and the slowest part was by far the content generation. RAG, TTS, Image generation, text rendering, and video processing were all a drop in the bucket, in comparison.

It would be an even wider gap now, and TTS is super-realtime, and image generation can be single step.