Feels like, just like humans, the response to "Hi" can be hard-coded. The system already knows the user, or if it's anonymous, it can respond the way a hotel concierge responds to a guest she's unfamiliar with, "How can I help?".

Google replaced its Assistant with Gemini on its phones, so instead of simple sentence parsing like "Set alarm at ..." or "Call...", it has to run the text to some freaking LLM..