The context is not the same. A snippet is incomplete and often lacking important details. It's minimally tailored to your query unlike a response generated by an LLM. The obvious extension to this is conversational search, where clarification and additional detail still doesn't require you to click on any sources; you simply ask follow up questions.
With Gemini?
Yes. How do you think the Gemini model understands language in the first place?
The protocols behind email are extremely simple. You can open a terminal, connect to an smtp server, and send an email by typing literally plain English commands.
Its simplicity and decentralization is exactly why spam and phishing is such a problem. Anyone can send an email as anyone else. Protocols for authentication were later introduced to at least mitigate impersonation, but those too are very simple and decentralized.
Maybe you should learn how email works today before trying to reinvent it.