SilenceIM and pidgin-otr add e2e over existing networks. That means I can attempt to send messages to people who won't be able to receive them. That is the opposite of 'just works'.
With Signal, or other services, where e2e support is a mandatory part of the client and is the only way to send messages, if someone is available on the platform, I know that I'll have a e2e message stream. (subject to MITM of key exchange, of course)
With Signal, or other services, where e2e support is a mandatory part of the client and is the only way to send messages, if someone is available on the platform, I know that I'll have a e2e message stream. (subject to MITM of key exchange, of course)