For users who want strong security is messaging signal should not be considered because they lie to users about their risks, and they store sensitive data in the cloud. It's easy to use and not a bad chat/IM system, but I would never trust it to protect your data.
In the spirit of CALEA, sealed sender basically pushes law enforcement back to good ol' days of "got the time", "got the IP addy", but "we don't know what was said".
