[daurnimator]

Email is also an archive of communications with vendors, shops and government departments.

Signal doesn't let you migrate chat history to your desktop.

Trying to migrate between phones while retaining your Signal history is too hard for most people.

Signal is not at all a suitable replacement, and I believe that forward secrecy is an anti-feature for an email-like usecase.

[tptacek]

You know you're in trouble when people start talking about forward secrecy being problematic. What you're saying about the "email-like use case" for cryptography is that it's unserious protection, because a lack of forward secrecy practically guarantees full decryption of the entire history of messages, for any ordinary participant in the system.

[daurnimator]

A major goal of an email-like system is full decryption of the entire history of messages.

Same as it's a feature of my filing cabinet that items don't incinerate themselves whenever I move house.

[0xDEAFBEAD]

>a lack of forward secrecy practically guarantees full decryption of the entire history of messages, for any ordinary participant in the system.

Can you elaborate?