No tab completion, but, not one actually typed out "set protection" - all you needed was enough letters to have it be unambiguous, so "set prot" was good enough. "Directory" = "dir", etc.
It's always funny to watch a Unix person trying to log off, more-or-less they will never figure it out unless you just tell them how.
I also note - I was once a VMS sysadmin for several of the *many* clusters we used to have. I still use VMS very frequently as it is the basis for several professional systems, and still have a great propensity for trying to use the EDT magic keys to do stuff in other editors. I couldn't actually explain to anyone what the key definitions are, it's muscle memory at this point. I have laminated cards with the magic key definitions on it for newbies.