Signal is pretty broken. A chat app shouldn’t require a SIM card & an iOS/Android device just to create & maintain an account (too bad Linux or KaiOS users or folks that otherwise don’t want a smart phone). Multi-devdice setups seem to have issues. The desktop app being Electron is a waste of resources. They still don’t want to support UnifiedPush while highly encouraging you download the app from the Google Play Store & send notification data thru Google-controlled FSM. There’s also the missing history of the server code which is probably has something to do with US intelligence injecting code.
Is it better than a lot of things, sure, but it should be put on a pedestal nor seen as exemplary for private chat in UI or philosophy.