I just hope there is an app that can hijack the keyboard and screen to automatically convert my clear text into encrypted text before I send it, and decode it automatically when I receive it. No need to fancy e2e that kind of stuff. Just encryption.
----
I know there are a lot of things to watch out for when talking about encryption and keys. But in my humble opinion, simple encryption can prevent at least 50% of the unintended leaks. For the rest, you got fancy tools like E2E, rotational keys, etc.