If you want capacity, you find a way of working on it. Regardless of what AJ says about overspecification, all carriers worldwide *abuse* the widebody fleets for shorthaul flights when they need capacity. All other airlines don't find it an issue, so why QF must be different?
Yup plenty of airlines use widebodies for domestic ops, but you're suggesting a dedicated fleet just to domestic ops... Japan/China are the 2 major countries where an airline could dedicate a sub fleet type just for domestic ops.
I didn't say the high density config must be domestic only, in fact it could do wonders flying to Asia where markets are more lower-yielding and I'm fully supporting (and suspecting) that QF will do that if they ever get a higher density plane, whether it's 787, A350, 777, etc.
Are you getting JQ mixed up with QF? Low yielding and high density, will work wonders with QF's higher cost base...
There's nothing from stopping QF from changing any of their A330's, 787's, 747's,A380's into high density configs, they haven't done so to date...
Also, for SYD-MEL, widebody flights exist all day long not just peak hours only. In fact with such a high load and next to no options of adding more flights (partly due to slot and gate constraints), the only way you can expand your capacity is to upgauge, whether it's 737 to A330 or A330 to B744 (in current QF fleet anyway). So yo either lose capacity, or you add more flights. SYD-BNE is in the same boat really.
Really??? Widebody flights exist all day between SYD-MEL outside of the morning and evening peak? Do a search of all flights on Monday 13 May 2019 (a typical commuting day) between SYD-MEL on QF, there are 4 A330 services in total, 2 in the morning peak and 2 in the evening peak, the rest are 737's.
As for SYD-BNE, there ain't no regular A330 services... All 737's...