We run it on our VAX. The article also says: "I don't think anyone else is working on new protocol features; instead, OpenSSH comes up with them and then peop

We run it on our VAX. The article also says: "I don't think anyone else is working on new protocol features; instead, OpenSSH comes up with them and then people with other SSH implementations either follow along or not." One obvious exception is curve25519-sha256@libssh.org which is the preferred kex.