Separate from our other convo, I just found this spicy note in Telegram's manual: "Multi-device End-to-end encrypted chats are a mess[...] Most of our competitors (notably, Whatsapp and iMessage) solve these problems in ways that make their end-to-end encryption useless (this is a big topic, so requires a separate manual)." And links to a TODO page. Can't just say that and leave us hanging!

https://tsf.telegram.org/manuals/e2ee-simple

My own distrust for Telegram aside, I like how these pages seem to be written by an engineer and not a PR person.