B744s are too big for frequency on the thinner routes, and who wants to fly long range on a B767 ?
......Seemed to be okay for B707's back in the day.
EK enjoy considerable cost savings with Dubai based non unionized labour, and don't have to follow Australian workplace laws.ie they don't have to pay inflated wages to non performing personnel who can't be sacked.
......You're welcome to come work here in Australia for free.