Well what I liked about signal was the ability to set a password for App access and an on-device encrypted database to protect any SMS messages sitting on the device from snooping if I lost my phone or having an interaction with the authorities as you can’t be forced to give up a password (as opposed to fingerprint, in the US).
I never really have any encrypted E2E messages. Just used it for on-device security reasons
Interstate travel is guaranteed in the constitution.