"Delta Chat has everything you could want in a private, secure messaging app."

The article doesn't mention the offline-first collaborative in-chat mini-apps that are a huge advantage, for example collaborative notepads, to-do lists, shopping lists, split-bills, etc. all end-to-end encrypted without dependency of a 3rd party service

also the app supports multi-homing! meaning you can use several servers at the same time and migrate from one to another without losing your contacts, groups, chats or messages. Your identity is your encryption key and your profile and groups live in your pockets so you are basically uncensorable