Willadvise
I don't believe there is a culture of expecting ATC to inform of a change, in actual fact I'd have thought most pilots would not expect that at all. I don't know how far back you go, but 20 odd yrs ago that would have been the case. If you look at the interim report how many times could they have checked the wx to find no change. When changes like that occur all a/c inbound to the port should be advised. Not many would have the flight following that QF seem to have picked up from the US, where that is the norm (actually, I think it may be a requirement). I doubt any smaller operators would, too expensive!
Pilots are being left holding the baby, min turnaround times, max payloads with a resulting minimal fuel uplift when prior to dep you have the latest and all is good, only to get airbourne to find it isn't worth jack. I cover myself as much as possible because what's happened here is what I have expected.