It is useful to keep in mind there can never be any kind of actual end-to-end encryption (#E2EE).

Your understanding of "end" is probably deliberately ignorant.

While you understandably so wish to believe the "end" was in the respective minds of the conversation partners, it is factually and technically located in the hardware and software of the devices used.

Which opens up a myriad of surveillance options, from sinister keyloggers; to simply glancing at your screens; to "AI" "assistants" "summarizing" what you're receiving, and allegedly just "fleshing out" what you're sending.

Even if conversation data was transmitted, "end-to-end encrypted", between brain implants, the producers or vendors of such implants would still happily provide backdoors for "law enforcement".