Wow I didn’t realize that Signal is run on Amazon’s servers and that they contract with the CIA. This article has some interesting points to mitigate the privacy concerns of this real popular service: https://simplifiedprivacy.com/signal-messenger-guide-to-avoid-privacy-mistakes/
Yes Session trades forward secrecy away in return for uncensored identity. These are pros/cons of different approaches and we provide educational material on a variety of software