It's only 'optional' if it applies to you. It applies to 767s, therefore we say it. Would you believe that we've been chipped for NOT saying it? Supposedly by ATC through our management but I don't trust my management much these days so who knows.
Now, if I give you a hammer, nails and some wood will you please just get on with building a bridge?
PS: QF A330s do it also. You'll also hear the Supers mention it at the required time also.
