According to my ATC cousins, the reason for the requirement to be at or below 9,000 at Tammi is to put a departure over the top of you. If you cannot make it and don't tell them, it causes a certain amount of tension. Where some of my workmates have come unstuck is remembering that if told to resume after being vectored off you must still meet the requirement. Last time I got caught tight, I asked for above 250kt below 10,000, they gave it to me and it all came home to mother. Sometimes I think ATC gets so used to the locals who have no problems, they forget a Long Haul crew might do it once a year and have an aircraft harder to slow down and get down. Not to mention every time I go to SYD these days I've been up all night and subject to brain failure.