E2E encryption is worth not much if the keys can’t be verified by the users. What I dislike currently:
It’s not so clear id the connection is encrypted before sending a message
It’s quite hard to find the fingerprints, also it’s “only” letters
Show a “secure” icon on the send button once e2e encryption is active
Display the fingerprints for example as smileys on a more central area of the user profile screen. Telegram is using smileys on their voice/video calls and it can be quite fun to verify the connection.
There are many secure chats systems out there these days, and delta has a really nice concept. But none of this apps have the “wow” effect. The ui/ux is quite boring and conservative. Telegram for example is just plain cool somehow. Fancy. It’s very easy to convince people to switch to telegram, but if they see delta or signal, they don’t like it in the very most cases.
This also explains the active user counts of this apps…