You must strive to find your own voice. Because the longer you wait to begin, the less likely you are to find it at all. Thoreau said, "Most men lead lives of quiet desperation." Don't be resigned to that. Break out!
Source
Dead Poet's Society
...and stick with them even when it's raining in their lives.
To get encryption one must start a "secret chat". It's an opt-in! Regular users will not even know the option exists, that's how well hidden it is.
Regular chats? Plainly readable on the server.
Most of the alternatives mentioned have such low adoption that they aren't truly viable options yet - no matter how much we wish otherwise.
And I say that not as a critic - I actually use Matrix, XMPP, and Jitsi myself. But guess how many of my friends, family, or colleagues are on them?
Exactly.
That’s why I recommend Signal. At least there, people are likely to find folks they already know.
By features, yes. By 10 miles.
Privacy? It isn't driving anymore at this point.