Comment by jraph

It does, because instead of having to share your phone number to Signal + all your contacts, you can share it with Signal only. It is an improvement. It doesn't address the case where you are not willing to share your phone number to Signal, but it addresses the case where you tolerate it but would like to discuss with someone with whom you'd rather not share your number.

I hope it will allow creating groups without forcing members to have their phone numbers shared with everyone.