Forgive me, you’re correct. I stopped using it when it dropped SMS, because I had only ever able to get people on it through SMS, but at the time had read plans about eventually dropping the phone number requirement. I mixed those things up in my head.
From what I understand, they’re fully invested in dropping the phone number requirement though, and some more googling says that they’ve had versions of Signal PNP (phone number privacy) running for a while now.
You’re correct, that part hasn’t actually changed over yet, but it’s in the works.