How is it any new? We, SSH users, have been doing it for a dozen years. What's interesting is how to use OpenSSH's ProxyCommand and netcat or socat on a remote

How is it any new? We, SSH users, have been doing it for a dozen years. What's interesting is how to use OpenSSH's ProxyCommand and netcat or socat on a remote (jump/intermediate) machine to go through with the target machine's name and address, not "localhost" and additional setup on a second terminal that needs to be up the whole time.