It doesn't help us all that much that a lot of people are using the Signal Protocol since they're using it in several incompatible silos. Whereas virtually all

It doesn't help us all that much that a lot of people are using the Signal Protocol since they're using it in several incompatible silos. Whereas virtually all people using email can communicate with each other. I use the vanilla Signal. I cannot talk to users of Whatsapp Signal. Also, there is value in email's address scheme. The person@organization.tld format is very convenient for identifying senders and recipients.