Earlier quoted context omitted.
What Gemini should be able to do with WhatsApp: Exactly and only what any other random app on the phone could do with WhatsApp, assuming that you have enabled that in exactly the way you would have to enable any other random app to do it. Google needs to not be abusing its position as the source of the OS to give its software special privilege to reach inside of third-party apps.
Unfortunately the situation on Android is that other apps cannot do anything with WhatsApp, and there's fuck all you can do about it as a user. I shouldn't need Google special-casing Gemini to allow LLMs to interact with my messages. I should be able to wire up Tasker to WhatsApp on one end, and to OpenAI or Anthropic models of my choice via API calls on the other end. Alas, Android is basically like iPhone now, just…
I also can't really find the mechanism at use here. I don't know if WhatsApp is exposing some kind of dedicated assistant API that an alternative assistant (the one you can pick in the settings) might be able to use.