Why is it so hard to back up and restore Signal? Why do you lose your keypair?

Hey, so I seem to have reached a dead end here, Signal appears to only offer plaintext exports, adb backup doesn't work, and importing a 29MB plaintext backup causes the new phone (an H631) to hang (sitting at the 35min mark waiting on Signal to import the backup).

I don't understand why I can't do a normal encrypted backup, I remember it working fine most of the time when I used to rerom, and when it didn't I could always do another backup and it'd be fine. Now, my father has changed keys due to changing phones & he has no SMS history and a few dozen Signal contacts who have to click a button before they can read new texts from him.

Why can't there be a checkbox in Settings to say something to the effect of "This feature may be broken, I understand and wish to try it" instead of literally no options when it comes to moving mobile devices?

Also, on another note, why no opus support? I've enabled it on a few hundred of our deskphones, and Linphone & many others support it. The voice quality improvement is tangible and more useful than GIPHY, to the point that I can't get other Signal users to call me via Signal due to the poor call quality.

Overall, it seems like Signal is getting harder and harder for myself and others to use over time, people want something where they can mail their <fill in the blank> a new phone, point them at a 3 step process to move their Signal data over, and that is it!

My father should be able to do this, just:

* Press Export encrypted backup * Move MicroSD to new phone * Press Import Encrypted backup

And that should be it! This is a baseline feature, even PGP does better by miles with this than Signal does, and I started out using Signal because it was easier and better than PGP, only to watch features slowly disappear. Its like feature atrophy.