I definitely believe the (ongoing) ATC staffing issues causing effects (as described so well already) has been a major factor in flight consolidation by QF on a busy route like MEL-SYD v.v. - it makes a lot of sense, specially when at peak times there's a 15 minute frequency. Now, it bites if you're on the one cancelled (and I'm pretty sure I'm booked on a prime candidate in a few weeks
) and then get shafted to a poor seat on the next one, or in the case of wanting J, potentially waiting more time (or being downgraded) to get you there.
Of course ATC is not the only issue - throw in some real weather going on (the other day, for example, MEL generated its own delays with some fairly gnarly winds affecting ops), but it's a consistent factor and has been for some time. No doubt, training up more ATC folks is neither fast nor cheap so who knows when the issues will be potentially resolved. I was also listening to a podcast recently, I think PCDU, regarding consolidation of ATC resources themselves - iirc basically two installations handle pretty much the whole country iirc? I'm sure
@evanb or someone else can correct me on that, but, as I understood it, for example, ADL is pretty much run out of MEL (for example). However, still need enough controllers to handle the various areas, approaches, departures etc - and to do it safely.
Whatever the causes, I think if you're a pax, you'd rather it was a high frequency route (like a triangle flight) that copped it, rather than a SYD-HBA or SYD-DRW or something for all sorts of fairly clear reasons. Well, of course we'd all rather NOTHING was cancelled, but if something has to give, I'd rather something like that.