yeah, i remember watching the announcement live, they said that in some cases it would prompt the user, like this

(photo taken from apples announcement blog post)

“anything slightly complex” is an overstatement though, it would ask for some specific LLM tasks, and the vast majority of what apple has built is not LLM or even generative. to me the most useful features are prioritising notifications for a semi-dnd mode and searching for objects in photos 🤷‍♀️