Become an email completionist, and send emails to other people as if they should also be email completionists.

Yes. I call it, “Talking In Real Life” (TM).

Email, chat and almost everything else is just text. All text is searchable. I think what you really want is something that searches email and chat systems for relevant topics and maps them together for your org highlighting things people are talking about. The search system would have to be aware of identities to avoid leaking sensitive information and causing corporate security incidents.