[cge]

As a counterexample: I use Matrix along with ~30-50 people, on a federated server, and every room is encrypted. After sufficiently stressing to people that they need to save their secure backup key, we've had few problems with encryption usability.

[Arnt]

That reminds me of RFC 1925 Truth 3.

[INTPenis]

   (3)  With sufficient thrust, pigs fly just fine. However, this is
        not necessarily a good idea. It is hard to be sure where they
        are going to land, and it could be dangerous sitting under them
        as they fly overhead.