I wonder how much of Siri AI is Apple-developed and how much of it is Google-developed as a result of Gemini. The a) search demos and b) image generation demos seem unlikely to have been done by Apple alone, the demos being closer to Google Search and Nano Banana respectively.
In my mind the Gemini LLM defines the bounds of capability and capacity, but any actual functionality or usefulness (or lack of) comes from Apple’s Siri harness.