Can I remove stg sync --undo ?

I'm preparing a patch that removes all the old --undo flags, and discovered that stg sync has an --undo flag backed by stack.undo_refresh().

Is it OK if I remove it? "stg undo" will allow you to undo the whole command, or, in case of conflicts, either the whole command or just the last conflicting push. But it does not allow for undoing the last refresh (whether it succeeded or not). I don't know how refresh is used, so I can't really tell if "stg undo" is currently insufficient.