> If you do use Signal as your default SMS app on Android, you will need to select a new default SMS app on your phone. If you want to keep them, you’ll also need to export your SMS messages from Signal into that new app.

This messaging seems a little tone-deaf, given that there is no way to export SMS messages from Signal. Apparently it's possible, using a third-party piece of software, to decrypt your backups and extract the messages, but that's not exactly a reasonable thing to expect people to do.

One of the reasons I liked Signal was because it was easy to get normal people to start using it, because they could just set it up as their SMS app, and continue life as normal, just getting the benefits of encryption for any of their contacts that were also using Signal. Now there's not notably any reason to use Signal as opposed to, say, Matrix.