A genuine discussion about the best FLOSS decentralized system to share poop emojis and videocall your dog.
Have you contacted the developers to discuss it with them and ask to see if it may or may not work for optimally making contacts untraceable?
Instead of simply criticizing SimpleX, talk with the developers directly about a passphrase recovery and see what they have to say about it for them to address your point directly insteadig of you saying it but never sharing your feedback with them.
I am not complaining about SimpleX. Just expressing a feature I would like to see. I could try to reach out to the devs about it though.