If we include the umbrella of machine learning stuff in iOS that gets branded "Siri", Siri finds useful connections between my firehose of email from Fastmail, my work Gmail, my text messages, and my Nextcloud calendar and contacts. Completely offline, without even mentioning iCloud.
The voice assistant is extremely clunky and I do hope they'll borrow from LLMs to improve it it, but they really are doing something right here with their modest approach, and "just use ChatGPT" isn't the solution people seem to think.