This reminds me of how you used to be able to disable the cypher on SSH and now you can't. I hate that.
http://serverfault.com/questions/116875/how-can-i-disable-en...
http://serverfault.com/questions/116875/how-can-i-disable-en...
Cipher - none.
So "ssh with no cipher" means "people can snoop, but I can use proper auth". But rsh means "plaintext pw - or worse things if allowed".