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> - simplicity of the protocol, especially the encryption

only simple for developers though - due to the lack of Cross Signing it is very difficult to keep communication secure.

What is cross siging in the messaging context?

implicitly verifying all (including future) of somebody's devices although running through the verification process only once.

Without it, e.g. if you log into a new session, you have to verify with all your contacts before you can safely use that session for communication